Malicious PDF — malware analysis report

Static analysis result for SHA-256 977bb1b062a40c61…

MALICIOUS

PDF

66.0 KB Created: 2021-02-18 21:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3d4e504aa0140b0ca4e9da2cff361bb2 SHA-1: ef6bf8839b5183c9bf49aa183425d94014248c3e SHA-256: 977bb1b062a40c6195727ffbb9d02026b2ac150e1f1b0109aa8a120f99b6c163
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'who am i worksheet for adults pdf', aiming to trick users into clicking the embedded links.

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=who+am+i+worksheet+for+adults+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453551/normal_60243e7b90c0c.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/pujokutixuvegitisinewopedw9qpr.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/Hjj9yij/99726849318.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465402/normal_5fcbd70c38fb6.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/ziesvZY/41539355919.pdfIn PDF document text
    • https://raxelapanaf.weebly.com/uploads/1/3/4/7/134746791/tapesosipo.pdfIn PDF document text
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/96638.pdfIn PDF document text
    • https://cdn.sqhk.co/radageroboko/hAWmWFl/dojavegajigobitu.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/9984806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5fedea576f1b0.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/bBS0jaC/tarelujebomirobogep.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/2fj3eja/56040887808.pdfIn PDF document text
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/8581814.pdfIn PDF document text
    • https://cdn.sqhk.co/ledivure/ij6l81Z/sibobixirujabereturi.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_off0000c4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DC 5448 bytes
SHA-256: 038af454ae86a4b7bff92d2027748a65ef7aa06f7c81ccb8ccc63205dd34cc2d
font_01_sfnt_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 10440 bytes
SHA-256: d10dededa27a3a33416d5ed1864719853a1ab9260c49bb43e7a78c7975f5bac5

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