Malicious PDF — malware analysis report

Static analysis result for SHA-256 457d4ecd2516746d…

MALICIOUS

PDF

93.7 KB Created: 2021-03-10 20:55:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03a77e05896b1d2f966005e17c0dcf5f SHA-1: 9ce7cd064ce8ccf1d87982a91ce95e5ac69af6b2 SHA-256: 457d4ecd2516746d79eef67f26591d3209d1894511fc71f9888305742fa9b80d
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to known malicious redirectors or disposable hosting, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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 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.
  • 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://yafferge.ru/123?utm_term=barracoon+pdf+free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4487191/normal_5fe16daaab006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474985/normal_600267579b0a8.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/3e0e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_60219a5f67c9f.pdfIn PDF document text
    • http://gixodugesu.medianewsonline.com/69900336055.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476002/normal_5fe3fc3412f7a.pdfIn PDF document text
    • https://nasotatuji.weebly.com/uploads/1/3/4/3/134392375/9572032.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/biglii7/ongc_buyback_offer_2019.pdfIn PDF document text
    • https://jenazikefu.weebly.com/uploads/1/3/4/0/134017187/29eb5d9d533a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5ff107182ec81.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/cLPjdii/los_angeles_hair_salon_reopening_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/faroziwe/7gfhCIp/98812471418.pdfIn PDF document text
    • http://kuxemanes.medianewsonline.com/18173084418.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/heqgigi/vojapuwezaruzubo.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/zifozujiwi/13800003259.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_404d7381df01492e81c98ab1241c43bd.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_9b604709c1784624af63db77553bd5e3.pdf?index=trueIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_3acc86404ba84199a5fd130abdbf7346.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/57679670148.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/lisipinimunikuxuwokisit.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_8ce9050540fe4ab8ad22315540e9d968.pdf?index=trueIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_9e45b982348945fbbe02d31cff2432d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/free_bill_of_lading_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/3762233126.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_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 4988 bytes
SHA-256: 24f39d809b8eed5c424b64b2f71f16bdf487cb4f9a9edd720dc4e67f768670ec
font_01_sfnt_off00012a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 12296 bytes
SHA-256: f6bc742d599c66855a52bc16cd851ce6e92d9ebc6e59b87f56b210f5b8be56b5
font_02_sfnt_off00015345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15345 16344 bytes
SHA-256: 8d3139c6de1b4c1a8ff00afc57e45680a86216e4be2c760ec3fc47319ce3aed1

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