Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d0e3da4c69d1b5…

MALICIOUS

PDF

74.1 KB Created: 2021-06-10 22:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ce2b8d68e0f01944c76f78956894f53e SHA-1: ce54ca0d59fbed957622c4e0d8bbc92f33625df7 SHA-256: c4d0e3da4c69d1b50df3afa337e27a4d922c5fc55a6f354703b96bfc0051d904
186 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 hosting and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/pbw?utm_term=how+to+make+slime+with+pva+glue+without+contact+lens+solution PDF link annotation
    • https://tabodixab.weebly.com/uploads/1/3/4/5/134585887/199ff9d5ef0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492294/normal_606290da9c769.pdfIn PDF document text
    • https://tagorawijetix.weebly.com/uploads/1/3/5/3/135392874/litavakop.pdfIn PDF document text
    • https://lumitagejul.weebly.com/uploads/1/3/4/8/134887152/wuwejebufobu.pdfIn PDF document text
    • https://toxafowusolele.weebly.com/uploads/1/3/2/8/132815148/lejeredam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403421/normal_60075d038e0fa.pdfIn PDF document text
    • https://gomopurijovovuj.weebly.com/uploads/1/3/5/3/135390772/lirugoxirevugukawop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_60109bb396712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_605672bc5f359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_6012128f3c7d3.pdfIn PDF document text
    • https://riwivuzis.weebly.com/uploads/1/3/4/2/134265818/luzibezovege.pdfIn PDF document text
    • https://sabitafev.weebly.com/uploads/1/3/4/3/134308069/baketozirur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_5fd3afbe90660.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5ff03f77aca9c.pdfIn PDF document text
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/bibakixomo_jusobupujukapi_xefufijasevon.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/4d466b69-d758-4cb8-b678-190f12b3bc36/how_to_make_your_own_box_for_box_jumps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d4ad35-767b-4c82-85c5-3a2dba184907/ponakon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0fe8e11-7a59-4aff-bde7-554e9d62fca4/how_to_use_a_moultrie_trail_cam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22dba5d6-3191-473f-aa9b-41969d89bcc7/53_bank_business_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/937fd5fe-684b-4234-ae4f-3589c4b681cf/58640946808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba8cfba-cab0-4230-b220-f23a553c5efe/baumgarten_aesthetics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5018b6-f66a-497a-9cca-c9d3cf94e3b8/clear_skin_forever_forum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e947c58-70ab-4ebe-85fa-2280ee99f81a/80519705510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dad36ae-3c35-47bd-84d9-e67cad5fbfa4/food_safety_manager_certification_test_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73d5564-d424-441c-a09d-0ddabbc3dbe1/three_paragraph_essay_outline.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 5428 bytes
SHA-256: f1742c8adf2335b0f7a38991d194ef495856f57f25d96cf8c7a4e3588abcfd4b
font_01_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 10620 bytes
SHA-256: cf86c253bc7c7acf21a927280954a559ce94151884d4f6fbcd828f6144b4bbe6

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