Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b6a9da0d46e0cc…

MALICIOUS

PDF

73.0 KB Created: 2021-02-16 07:21:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 57f27b62c1d456f26bb5017bcbf3b36e SHA-1: 1d252b7ef678bc3bf1751766b924663cc367700d SHA-256: b1b6a9da0d46e0cc8036a2169edb538cc12e4dc225f2b75d727e8fdd36fc0bdb
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded links indicate it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=drinkwell+zen+pet+fountain+manual PDF link annotation
    • http://trysalon.xyz/chicago_bulls_schedule_2018nxxs9.pdfIn PDF document text
    • https://vapulorefemefiz.weebly.com/uploads/1/3/5/9/135956910/xuxamusukotanove.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/gPqjHGe/55540265603.pdfIn PDF document text
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/bf3ac140596c29a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421209/normal_5fce6ce69ad11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498702/normal_5ff5fa278f6c4.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/ciiVOji/demanavonibomuvifip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479932/normal_5fe25be6af41e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444852/normal_600ca2ed5e6ae.pdfIn PDF document text
    • http://podarokinsta365.site/sojurukob74qqo.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/icMGAhd/dolureruxogumiwemosixib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379744/normal_6026bc29b0486.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/fedojigudaj/fuwusudovumafuzijemid.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/charles_law_worksheet_answers_page_21.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 5072 bytes
SHA-256: 0de48ab7371676c1da0328d39603606ce14169e415fc6f72befcde3e93a47b8c
font_01_sfnt_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 10448 bytes
SHA-256: 48f662b6f7493983d66aabb8237afdf5c3a3c7ef203e75fbd6dbc75cd50b51ee
font_02_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 16384 bytes
SHA-256: 226a8e4e528c820945b068501793868e9b71e899c703a7ad804f9a2f424011a5

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