Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71acae3b493613e…

MALICIOUS

PDF

88.1 KB Created: 2021-03-02 00:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d9dc48f1fec88de5c272dc4f293d96ee SHA-1: 6c379fd42a72d8d35141ad0c0fe7724a85fd5cec SHA-256: f71acae3b493613e38efb34177e2da10e414d2d0ea305c2a68088f88e740ede9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, containing numerous external links to other PDFs hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. The presence of external URIs and a high number of PDF links points towards an attempt to redirect users to potentially harmful content.

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://soxebez.ru/strik?utm_term=best+vocal+processor+for+pitch+correction PDF link annotation
    • https://jarofipe.weebly.com/uploads/1/3/1/4/131408229/basomid.pdfIn PDF document text
    • https://fesoviso.weebly.com/uploads/1/3/4/7/134710514/7377995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_60186dbe62b26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487409/normal_6034bfd64a39a.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/b472e009b6a0.pdfIn PDF document text
    • https://kowizonijate.weebly.com/uploads/1/3/5/9/135991151/8582460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_60278483b56a9.pdfIn PDF document text
    • http://italiahot.fun/new_alcatraz_full_movierv9tx.pdfIn PDF document text
    • https://ganipomadajo.weebly.com/uploads/1/3/2/6/132695424/038d8833.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470687/normal_5ffe9ad206a5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369191/normal_5ffcb0f6c2a85.pdfIn PDF document text
    • https://wikifepum.weebly.com/uploads/1/3/3/9/133986434/domufibigiriw-bunukejivigub-wariwepub.pdfIn PDF document text
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/8658548.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xupimaral/pre_and_post_testing_in_sport.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/4416710625.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/brother_bear_kenai_transformation.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/vojawiwur.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 5000 bytes
SHA-256: 9f6080e8ce0d84727566f603d80b328b6d2c0679c985c7f91756c2d8a0eb2720
font_01_sfnt_off00011fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 10964 bytes
SHA-256: 3200a373bac09a517fb13b327e1a2db2a5639105304ee7822bbcbbdde23d9b88
font_02_sfnt_off0001453e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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