Malicious PDF — malware analysis report

Static analysis result for SHA-256 673393717be9f0a1…

MALICIOUS

PDF

79.8 KB Created: 2021-03-16 22:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 39f266ae53c28c497f2aa344db9bfcbb SHA-1: 258cfba0a4013770d1f7cc4fe1c92f0e3e740797 SHA-256: 673393717be9f0a155b02a112dc06957e73f9a447fc558a16d1cdb441250baad
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and external link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/strik?utm_term=how+to+use+one+touch+blood+sugar+monitor PDF link annotation
    • https://dusalunefawotof.weebly.com/uploads/1/3/4/4/134487283/5211816.pdfIn PDF document text
    • https://juwalonivegab.weebly.com/uploads/1/3/5/3/135309433/1d10d9a676.pdfIn PDF document text
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/feeae2079.pdfIn PDF document text
    • https://bowotile.weebly.com/uploads/1/3/4/7/134759747/1ad002d4488.pdfIn PDF document text
    • https://xonujofepip.weebly.com/uploads/1/3/4/3/134385468/2745d8800cb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af47867-555a-457d-a556-7b10243a5c7a/bekezumexo.pdfIn PDF document text
    • http://dipomik.epizy.com/nomeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d3f7f5-26ae-4c3c-8131-16dfcc9d7fbd/19142461764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcbee0f0-0728-4d50-af51-16ab7adb24e3/kapaser.pdfIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_4c84f58784c2443cb9955052b4dc2f74.pdf?index=trueIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_34b1103ca91146359e2a4a117af3fe0c.pdf?index=trueIn PDF document text
    • http://dapobepopid.rf.gd/gizitaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a4993e-165f-4bfe-8d79-7da98719c83e/geluwigefizalijesujivewut.pdfIn PDF document text
    • https://d90c6e9a-74f4-4e1e-b9b2-b16ff3e5d9fd.filesusr.com/ugd/136d07_7635863bdec24e1fa2046385cebaa8eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f60516-ae27-4df1-8bd7-e976ebaca547/how_to_learn_guitar_blues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f60408f0-1103-4621-8198-18a6336906b9/bruce_lee_tamil_songs_download_320kbps.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_b965f53ae0c84f66a74f910436f59f54.pdf?index=trueIn PDF document text
    • http://pepukogabam.rf.gd/wivorolusuvigapediloma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6457a310-dfbd-43e8-8940-5ab87ab07536/dating_scan_pregnancy_8_weeks.pdfIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_d3186d72d2ba46c9ac9f2f7fe80701f9.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_eaf869767bed4094834b26b59618b5c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22fe9f8-b12d-4c3a-81b7-8100eb6d4723/what_kind_of_oil_does_a_honda_accord_take.pdfIn PDF document text
    • http://fevakizifawe.rf.gd/rinnai_error_codes_12.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_0910cf46c35240e2906b58af5926ad02.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/021cdd09-0669-4b41-bce5-15be72aa74d0/47466734541.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_b0af59d33ef2481bbf8fc42b1a578359.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 5544 bytes
SHA-256: c2b54aac11fd943486535906815fc5411f5f9a7a816844859723679b3f0f0e7e
font_01_sfnt_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 11160 bytes
SHA-256: 9d3a6328a2ee7073c12d6a5ec1a1f80a9d9354acfbade4fcc0ec603f3072f8da