Malicious PDF — malware analysis report

Static analysis result for SHA-256 89578bfe39c3488f…

MALICIOUS

PDF

76.4 KB Created: 2021-03-01 16:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 16f6f2039e11369159715c71a03a0d59 SHA-1: 3b87fcabe952c0f49d7f94b939aa3d3acf71a3ce SHA-256: 89578bfe39c3488f35704e971ca3e1dd3abce46a3dcea4c88974e9f95dc67800
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, possibly for phishing or malware distribution.

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://jottigo.ru/strik?utm_term=tc+electronic+flashback+triple+delay+midi PDF link annotation
    • https://nixixope.weebly.com/uploads/1/3/0/8/130874324/xuworeno_tijej_zejetevowikiz_kipep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fcaa34912d2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489058/normal_5fe3a902f17ca.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/skyjack_3219_ops_manual.pdfIn PDF document text
    • https://kozedisibep.weebly.com/uploads/1/3/4/8/134898116/pidibukilugolejeto.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/zonafexuxosotolit.pdfIn PDF document text
    • https://cdn.sqhk.co/wametofenuwo/ajcjiXw/nbc_sports_boston_celtics_announcers.pdfIn PDF document text
    • https://tineminelebon.weebly.com/uploads/1/3/1/6/131606156/313076c09.pdfIn PDF document text
    • https://tapogizixe.weebly.com/uploads/1/3/4/8/134897788/texupirawuf-sepimefar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_6027674072b20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453743/normal_5fd37c067b222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5ff59fe9098e7.pdfIn PDF document text
    • https://gufulesem.weebly.com/uploads/1/3/4/6/134698375/496f9c382edb5.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/jdFEtuU/banco_bradesco_s._a._bbd_bcba.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/85786262355.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_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 5648 bytes
SHA-256: b07052bf0bf94a1b04006364b267e951caceb6eb35b784b020a6cd57efcb48b8
font_01_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 10680 bytes
SHA-256: 506fbccf87ad13e0e48b831ea96c5b9b6be8aa4e4e7afd3007dc1230887b5a2d

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