Malicious PDF — malware analysis report

Static analysis result for SHA-256 997090491a3c196f…

MALICIOUS

PDF

85.1 KB Created: 2021-05-07 22:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b30d7ce9dedbd0545b32a4731774a1d3 SHA-1: 037ede8473d9d036cfe67ff6aea17eecd57db1ef SHA-256: 997090491a3c196f7443777df5e9657aedf323d6bef97d36bf32727168b861dd
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('resalured.ru') that is likely part of a phishing campaign. The document body, though heavily obfuscated, suggests a lure related to a 'menu', which is a common tactic for phishing or scam operations. No scripts were extracted, but the PDF structure and URL analysis strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=american+buffalo+wings+and+seafood+menu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480397/normal_6031f5c955696.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382960/normal_5fce152685bb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462992/normal_601d44edd453c.pdfIn PDF document text
    • http://foyou.store/formula_para_calcular_perdidas_insenlhby5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446270/normal_5fd091b4279c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_602879727a03a.pdfIn PDF document text
    • http://theraisins.pro/72475598243ckzqz.pdfIn PDF document text
    • http://operationhomeplate.com/predator_4000_priceh0u64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453344/normal_5fc773de2e6a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424364/normal_6067c934ef8eb.pdfIn PDF document text
    • http://chaptejvxz.fun/breakup_song_for_whatsapp_statusiz9gj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484814/normal_60265013131e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487658/normal_600d1a57b076d.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/makixibawumebol/bojoru.pdfIn PDF document text
    • http://fazevomegefeg.rf.gd/17743272733.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/70446468580.pdfIn PDF document text
    • http://fizuxobitunoge.epizy.com/malexugebavenuxaloxexuram.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/time_little_alchemy_2_cheat_sheet.pdfIn PDF document text
    • http://luxusuriva.epizy.com/atropin_sulfat_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/how_to_reset_a_bryant_thermostat.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_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 5560 bytes
SHA-256: 3f6416f4cf02463fcf0f505bc48f8613ef7de4da0d6511a944c3c7f89d05e383
font_01_sfnt_off00011edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDB 11984 bytes
SHA-256: f19aaf4291069d62ae27400e15ed7e4dd1c0f9ed95cb3c022567af507cb38224

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