Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fd177bde93a334…

MALICIOUS

PDF

78.8 KB Created: 2021-03-28 17:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5f1f6ee9c0d9f5ad6a2121d8c46facf8 SHA-1: 4b3b06586148915a70884cadae14fc83e0ff31c0 SHA-256: b7fd177bde93a334675ab5d1e051ae1060bf6ca884fd8988cbc1c1ed0bc4829c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains malformed streams and is flagged by ML classifiers and ClamAV as malicious, indicating it's designed to exploit vulnerabilities. It includes numerous URLs, some of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded content, though heavily obfuscated, likely serves as a lure to these external sites.

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://seumenha.ru/aws?utm_term=what+does+a+callus+look+like+on+your+feet PDF link annotation
    • https://cdn.sqhk.co/xoraxuvonaf/6hhihJf/60201188664.pdfIn PDF document text
    • http://apparentlyopt.com/pibatumoduluwenotakpv6k8.pdfIn PDF document text
    • http://seomagnat1.online/libro_picardia_mexicana_armando_jimehxxnw.pdfIn PDF document text
    • http://tradebot.space/how_to_start_a_newspaper_article_examplerkunp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426418/normal_6013867abd600.pdfIn PDF document text
    • http://poxexududojal.66ghz.com/cardinal_utility_and_ordinal_utility.pdfIn PDF document text
    • http://center-san.ru/why_does_microwave_not_heat_food1eaho.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuwene/d0Rnihe/is_there_a_diamond_sword_in_minecraft_dungeons.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/WI2iAjf/smart_car_weight_reduction.pdfIn PDF document text
    • http://feyakast.online/75793519902uqhif.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/cehjw5a/31156790110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_604068ab3fe53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://senoburem.epizy.com/46341390386.pdfIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_1cf0e0d977f84df1a030f4f8c0300021.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/18865716437.pdfIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_46e3c2b4d47c48739fe949d57579edaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kabisebax/marlin_336_scope_rings.pdfIn PDF document text
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_fdccd6ea53474d08a82c7333f1ad20b3.pdf?index=trueIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_84f3a1673e7d4ec38d15f39fee76a821.pdf?index=trueIn 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_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 5288 bytes
SHA-256: b1e13f9ccc8e1ee4723cb42621840a29f86ad12760187590231e9c32ac8f2a68
font_01_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 11128 bytes
SHA-256: 8d614773443c3d99c6bb3636fe997fb133c10aac6917fbcdcc86bdf7200a270a

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