Malicious PDF — malware analysis report

Static analysis result for SHA-256 8555ed11706055bd…

MALICIOUS

PDF

72.3 KB Created: 2021-02-23 12:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 22faf8bad97390766c8a62a397ae9795 SHA-1: 0699a0769b18f9cb6890c1f4d45270c16da24438 SHA-256: 8555ed11706055bddb5eb28c789cd99c2fb2bf248e333d6ab489a3f294b50556
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic confirming the presence of numerous external links. While no scripts were extracted, the presence of embedded URLs and the overall structure suggest a phishing or malicious redirection attempt.

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://baarspo.ru/wix?keyword=3410+south+51st+avenue PDF link annotation
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/1065067.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/4gfhdgf/draw_a_stickman_epic_2_free_download_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/67ghghc/adls_nasa_tv_live_channels_app.pdfIn PDF document text
    • http://powerhdniy.space/rutegejozivsafpg.pdfIn PDF document text
    • http://tunizunifegitof.66ghz.com/wedding_bathroom_basket_sign_template_free.pdfIn PDF document text
    • https://lelamibi.weebly.com/uploads/1/3/0/7/130738841/vimikobiloxev.pdfIn PDF document text
    • https://voropulunonuz.weebly.com/uploads/1/3/5/3/135316946/1414693.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/ggjcZoT/raid_hq_hack_apk_pubg.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/fMXfM88/wize_enterprises_amritsar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zetazuzetebutef.epizy.com/bells_of_notre_dame_piano_sheet.pdfIn PDF document text
    • http://pudunajuge.rf.gd/votaralafiganibo.pdfIn PDF document text
    • http://bokubipojofoji.rf.gd/gastroenteritis_viral_pediatria.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/21988355193.pdfIn PDF document text
    • http://xorewabamav.epizy.com/gipanurok.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/boliy_generator_manual.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_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 5180 bytes
SHA-256: 0f083e64d8c48f59ac3658111628e7ec614a004cf464febbeb2928019b3735d8
font_01_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 11016 bytes
SHA-256: 378e89e14fc5d04ebbdf7b7fbf66bc4f47bea6fefb3725f05c44f710a3e19d03

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