Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab33251bcd6dfd6…

MALICIOUS

PDF

79.1 KB Created: 2021-02-15 10:39:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8736b89dbc042fb43827c93cf6896e68 SHA-1: 219e17c8b0f13ed020e0dc205aa5c845123cfa97 SHA-256: 1ab33251bcd6dfd661a74a04936f1ebf6f099d88f61bbd43e7c194173d972901
194 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, suggesting a link farm or SEO poisoning tactic. The presence of a 'download' button lure further supports a malicious intent to redirect users to potentially harmful content. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/123?utm_term=bella+waffle+maker+user+manual PDF link annotation
    • http://testertumentum.space/zagifadegodultlwe1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372382/normal_5ff390a1b392e.pdfIn PDF document text
    • https://nonafinawajag.weebly.com/uploads/1/3/4/3/134331790/e4c2bec14909dc.pdfIn PDF document text
    • https://verigidiloje.weebly.com/uploads/1/3/0/8/130874422/553307.pdfIn PDF document text
    • http://hushseo.online/73459793791q77tb.pdfIn PDF document text
    • https://rudazijix.weebly.com/uploads/1/3/1/4/131453676/lopediralebemugovuva.pdfIn PDF document text
    • https://nebenumepidenok.weebly.com/uploads/1/3/5/3/135307723/lokojodij_fizile.pdfIn PDF document text
    • https://pofitokibifezaf.weebly.com/uploads/1/3/5/3/135394855/7907781.pdfIn PDF document text
    • https://zurirepazigotot.weebly.com/uploads/1/3/0/9/130969164/lovuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375200/normal_602229e902663.pdfIn PDF document text
    • https://roxejozojone.weebly.com/uploads/1/3/0/9/130969259/2954644.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501770/normal_5fde6f339acbf.pdfIn PDF document text
    • https://dovejopizodumu.weebly.com/uploads/1/3/4/8/134883147/7254080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482648/normal_5fdb169563a54.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/wijisizitolaket_tawidotaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479691/normal_6029c3ec8975d.pdfIn PDF document text
    • http://soxiwokix.iblogger.org/boro_chele_full_natok_free.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/5319676.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jopavufugas.epizy.com/rivogevesajasumorakavumir.pdfIn PDF document text
    • http://dojeranorered.epizy.com/72980492843.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_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 5120 bytes
SHA-256: 10b461a7faa7571fad8c9eb54d4268b467b30c7368c4dc0304f96fbc45d2c765
font_01_sfnt_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 11076 bytes
SHA-256: 8cec27c9a8525c31e1f97a2e1be44e5e7f3c38ec3a72e2f1a3eb87728abd31c8

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