Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8dcdca16fc0aee…

MALICIOUS

PDF

70.0 KB Created: 2021-03-04 08:54:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ced61ddc244fdfd757d80e49376729f SHA-1: 18fc2b716cffebbafffdddb8206de75a9c8ca22e SHA-256: 7b8dcdca16fc0aee75e548ed7a5e625275f23323b767808f28319c30699d0976
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, likely serves to direct users to these external sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jacksth.ru/wix?keyword=verbs+that+start+with+com PDF link annotation
    • https://zukusabaxiwig.weebly.com/uploads/1/3/4/0/134000387/finidikefibibas.pdfIn PDF document text
    • https://reratedazakowim.weebly.com/uploads/1/3/1/3/131378897/4aba673e38e.pdfIn PDF document text
    • https://vipigenomunopem.weebly.com/uploads/1/3/1/3/131398348/9143306.pdfIn PDF document text
    • https://zukudanasoxe.weebly.com/uploads/1/3/2/8/132815154/2960161.pdfIn PDF document text
    • https://xasevezivim.weebly.com/uploads/1/3/5/3/135302984/degorajap_zefukojewikov_lupus_buxodapobukozif.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/6940470.pdfIn PDF document text
    • http://flymoney.net/miriam_truman_capote7ru79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5fd7b09ecfb6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402740/normal_5fec20f0f3c3c.pdfIn PDF document text
    • http://mixed-rootwork.com/inkheart_book_author0uuk4.pdfIn PDF document text
    • https://vizifota.weebly.com/uploads/1/3/0/9/130969876/dofigif.pdfIn PDF document text
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/dc6f8c98b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_6030081fe15e6.pdfIn PDF document text
    • http://biolinkus.me/michigan_foliage_report_2019uosjw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 5204 bytes
SHA-256: ac9993f067180d831187e010d88de76568ced3bceff309c8012715449396336c
font_01_sfnt_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 9428 bytes
SHA-256: 9da1901ad411196df320ac4704030a1a031b31a99d2254c5cb5b07f1bc30fdf1

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