Malicious PDF — malware analysis report

Static analysis result for SHA-256 872ed0363ad0103d…

MALICIOUS

PDF

84.4 KB Created: 2021-05-24 14:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6807f59187af9d044608a929f3f08313 SHA-1: 805cca9bd3b3d37d2ac3e63f11315b931f1d0f90 SHA-256: 872ed0363ad0103d93a003fb8d7bb85550d0aad3c87e0abea31e542ded8714e5
186 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to various other PDF documents, likely as a phishing or spamming tactic. The primary malicious URL identified is 'https://resalured.ru/strik?utm_term=how+to+reset+replace+toner+in+brother+printer+mfc-l2700dw', which is part of a disposable link farm. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://resalured.ru/strik?utm_term=how+to+reset+replace+toner+in+brother+printer+mfc-l2700dw PDF link annotation
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/9c8e383dace69.pdfIn PDF document text
    • https://kawotubizon.weebly.com/uploads/1/3/1/8/131871780/febedoboleru-mapagolevide-bogix.pdfIn PDF document text
    • https://vozopameniv.weebly.com/uploads/1/3/4/5/134593493/vazelofi-warekilasaxu-papiv-popaxukite.pdfIn PDF document text
    • https://moxatabik.weebly.com/uploads/1/3/4/8/134885740/1c34e134.pdfIn PDF document text
    • https://tupodawemizaz.weebly.com/uploads/1/3/4/5/134594588/992d0a.pdfIn PDF document text
    • https://womerakuketuzal.weebly.com/uploads/1/3/1/8/131856195/berijox.pdfIn PDF document text
    • https://legovizadedugid.weebly.com/uploads/1/3/1/8/131856283/kokisu.pdfIn PDF document text
    • https://talowitutujuf.weebly.com/uploads/1/3/3/9/133999148/9818640.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/4295416.pdfIn PDF document text
    • https://fekukutetixamam.weebly.com/uploads/1/3/4/6/134636283/6791374.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a31db3ff-5d0c-4296-933f-349846619166/romeo_and_juliet_movie_2013_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/blank_zimbabwe_affidavit_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98612044-f378-4e8a-a3ce-5425ffbd1ee0/top_notch_fundamentals_third_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/74024655462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e16f13-d475-43b6-8917-ba1e7ea1e50d/14580806642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c865c1e-fa38-4438-8325-ab33b4f53b1e/51583347803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6661963a-bc6b-4453-a1b8-4a32628a1c2e/will_cyberpunk_2077_run_better_on_xbox_series_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3141b680-6ec8-4cbe-9fd8-15cf98e7cc74/79228478651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430efae4-34a1-4c99-b9f0-82c6aad78471/powunolumodokugexitusifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbbb9f91-672b-4763-986e-634738cfe716/prayer_not_to_die_young.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f4162e-8379-42bd-8da2-ff076c11fe63/fujawuresisaradafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46020058-5f8a-4db6-8764-923dabad4623/zufunuxujajanodogujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/465a7026-cdef-4c75-9dee-eb20036be3e0/pajalolulab.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 5764 bytes
SHA-256: e8de0235f34b0b9aa79a9d30a1c6598383bbc85b453c69c7d1e7ad01985873bc
font_01_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 10976 bytes
SHA-256: 9eec3f6f3c3eb87dbb21d82f3c12399dbd2135424cca2a2cfacc2b0f18d23e64
font_02_sfnt_off0001362c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362C 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230