Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71cea002ecf0412…

MALICIOUS

PDF

85.6 KB Created: 2021-03-03 05:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c5aabb416ee1604ab6582450dbc29fca SHA-1: 65430d7f54ec3661ce12988aa9db725042432d3a SHA-256: b71cea002ecf0412ef21ec1206b704d0287bb4fe56996cf9f4ec52df19ca5e15
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The presence of a 'utm_term' parameter in one of the URLs further supports the idea of tracking or redirection for malicious purposes, likely to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://jumiwimov.ru/123?utm_term=acer+aspire+v5-131+battery+removal PDF link annotation
    • http://particulier-societegenerale.xyz/wuzivurj8wiq.pdfIn PDF document text
    • https://temisufe.weebly.com/uploads/1/3/5/3/135384001/rinupemezedoxizovolo.pdfIn PDF document text
    • https://rofasotukez.weebly.com/uploads/1/3/0/7/130740205/d0b771dab19e.pdfIn PDF document text
    • https://medotufise.weebly.com/uploads/1/3/4/5/134512565/gopaf.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/dd7d66.pdfIn PDF document text
    • http://seamanygau.best/xenophobe_guide_to_the_irish6hkcq.pdfIn PDF document text
    • https://fimiximokizo.weebly.com/uploads/1/3/1/3/131384127/7713734.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/4845135.pdfIn PDF document text
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/xogaxo.pdfIn PDF document text
    • https://bopovajo.weebly.com/uploads/1/3/5/9/135966354/1342932.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/larokaxagafut.pdfIn PDF document text
    • http://lnstagram-office.com/wugalenasininp4i94.pdfIn PDF document text
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/dcb64c2c.pdfIn PDF document text
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/fc5005c.pdfIn PDF document text
    • http://natlab.ru/catalogo_de_pernos_y_tuercasbiblv.pdfIn PDF document text
    • https://wawotisusuwo.weebly.com/uploads/1/3/2/7/132741293/e7392ab5493c.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/gojuzud.pdfIn PDF document text
    • http://www.opentle.orgIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ff64.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFF64 12632 bytes
SHA-256: e3e4b11fd75608c08c9e9190f62f6a1b71019ecfb052b01839db40c6957ffd1f
font_00_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 5744 bytes
SHA-256: efcee6995b9c246bbf134227e7f510cebf2d91238fd4513ca7d090712584d96b
font_02_sfnt_off00012358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12358 10908 bytes
SHA-256: 5cbe7e27bad64d33e75a656f2df7f0ad87c0b7cb0d4f2308e027e0e9c1107e69

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