Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f572ead5eab6e19…

MALICIOUS

PDF

81.9 KB Created: 2021-01-26 02:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 142d2dcf60376bf2985ba636c4262c93 SHA-1: 764ec4c2e58b115dba70200b5e40af641a18d9f7 SHA-256: 3f572ead5eab6e197457ec339c5cfd8d7d785aaa2769e11f50d7e3bbce11b736
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, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains text related to 'response to USCIS request for evidence', indicating a lure to trick users into visiting malicious or spam sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=response+to+uscis%2527+request+for+evidence+was+received+means PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490264/normal_600d43846e95c.pdfIn PDF document text
    • https://kibowoje.weebly.com/uploads/1/3/0/7/130775027/femaluwe.pdfIn PDF document text
    • http://capridigi.com/18779041633h6d47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470412/normal_5fe36effd231d.pdfIn PDF document text
    • https://danawojigu.weebly.com/uploads/1/3/1/4/131407111/tutikupegerab.pdfIn PDF document text
    • http://aduo5.online/pelefosupugibizidjimer.pdfIn PDF document text
    • http://naykaryadom.fun/72727201760u8yv4.pdfIn PDF document text
    • https://nubukagogurug.weebly.com/uploads/1/3/4/4/134495847/5056294.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/8a01b2f83ab.pdfIn PDF document text
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/dabexim.pdfIn PDF document text
    • https://kofoxutekibefa.weebly.com/uploads/1/3/1/4/131454286/tuvum.pdfIn PDF document text
    • http://mnatural.space/dajutumiguxijipy0rfr.pdfIn PDF document text
    • http://ogranicbio.fun/photo_video_maker_app_for_pcmwdba.pdfIn PDF document text
    • https://bejamipoxef.weebly.com/uploads/1/3/5/3/135318713/pafoligowejaz.pdfIn PDF document text
    • http://naturaleone.space/defender_24_hour_segment_timer_manualpjyto.pdfIn PDF document text
    • http://hookup153.space/rubirumibivafolepor31zig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/vakufijofibakadoviza.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/vb._net_from_url.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/adverbs_worksheet_for_class_4.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/2692797543.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_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 5588 bytes
SHA-256: 0555f27b9cd675ef4a46f916b27766e2a01311d09cd37fc96103e132e8abd21e
font_01_sfnt_off000114ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FF 10676 bytes
SHA-256: 33d0cd064f1bb90b97ef90448f368dd31155e930faec9412a7f86bcc279a40fa

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