Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4671560d93979e1…

MALICIOUS

PDF

73.8 KB Created: 2021-04-05 02:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 91ebc2248647f2b7565d08d95f694bf5 SHA-1: af448ab58c8f6f84f718a1fe8bf387cb7f310b0b SHA-256: a4671560d93979e1aa11566899814e6d8a50707fc54ce6e59bab8b2605727270
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://crophysi.ru/aws?utm_term=why+is+my+vizio+smart+tv+remote+not+working', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to Vizio TV remote issues. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=why+is+my+vizio+smart+tv+remote+not+working In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_6049bf93378c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408582/normal_6060fb0ecfda7.pdfIn PDF document text
    • https://bunixidulot.weebly.com/uploads/1/3/5/9/135964284/1798285.pdfIn PDF document text
    • https://mubajodopiwal.weebly.com/uploads/1/3/1/4/131454521/dced2ad2d2a6adf.pdfIn PDF document text
    • http://sewiximafa.22web.org/53934448642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420034/normal_602c2206d95d4.pdfIn PDF document text
    • https://siganagimub.weebly.com/uploads/1/3/2/6/132683357/jetogojexunif_vadowugiwixes_wimazinumi_nuwifedizopef.pdfIn PDF document text
    • http://sutivebako.iblogger.org/libertango_trumpet_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_b2189f0a649147bf88fbd957f4b71b91.pdf?index=trueIn PDF document text
    • http://terezeso.epizy.com/curious_george_upside_down_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d12513-50f8-4ce0-ab1b-aebf2c45719c/what_does_a_software_development_project_manager_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf761c4-f7ea-401d-85e1-e048cd6e4fbe/avoid_using_the_word_very.pdfIn PDF document text
    • http://fewajun.epizy.com/30286891279.pdfIn PDF document text
    • http://fusaxisedafi.rf.gd/english_spell_check_dictionary.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_f5e1c09dbad943888a5f06695052366a.pdf?index=trueIn PDF document text
    • http://gejopap.rf.gd/goxonalukinilewovebip.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_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 5448 bytes
SHA-256: befb8679feba76edf1ac440b23378e3edcdc249449ac2a123c7c349d7977d6da
font_01_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 11020 bytes
SHA-256: f162253b5d15d2e04d23fb88714e674e62157ca36377315a8e9715ac6beff29a

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