Malicious PDF — malware analysis report

Static analysis result for SHA-256 e462088e33379f48…

MALICIOUS

PDF

77.1 KB Created: 2020-12-19 00:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cc1fa10a77b09d77975875944d0826ad SHA-1: 7f0e8ac131b537d2a82e4142a88a844f8ed5d1e9 SHA-256: e462088e33379f4816ce52ebe34d8abeacf898938171e392d43be2c18dcb7d27
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external PDF files hosted on disposable domains, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic firing for PDF_SEO_LINK_FARM strongly suggest this is a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/aws?utm_term=bendy+game++pc PDF link annotation
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/4156737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5fb254716f506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374185/normal_5f896709a28b3.pdfIn PDF document text
    • https://bavamelamasol.weebly.com/uploads/1/3/4/7/134714994/dobizawokofodekex.pdfIn PDF document text
    • https://tedisizizifem.weebly.com/uploads/1/3/4/2/134235801/kofitulaleg_zugorefuj_pesumosoladexom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405642/normal_5fdd2828d9eed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494138/normal_5fcf069809dd5.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/liwixizuladogefi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5fcf9fe4dab5b.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/wujalepidoxanirol.pdfIn PDF document text
    • https://vunuvuvoxi.weebly.com/uploads/1/3/4/8/134889930/9361606.pdfIn PDF document text
    • https://rugazodexozapef.weebly.com/uploads/1/3/4/4/134480570/rasowaderogolek-punagozimubutef-wizewubopewuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5f8e38020d698.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc36ff3c6d9645836323309/t/5fc92a7c0fdfc4414058858b/1607019145356/bubble_bird_3_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/daily_language_review_grade_4_week_22_answer_key.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_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 5236 bytes
SHA-256: 5092e740f6719d89b4ee0f62090e597c23a74c483d63e1519997961ef20aa9c6
font_01_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 10828 bytes
SHA-256: 910663f9391d63ee18f50c9102bfad247d0bc0f2143bf42c0f9a180761169317

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