Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9606833cb3d325e…

MALICIOUS

PDF

83.2 KB Created: 2021-02-24 19:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c3af7acc62652d3c58b5cde7477198c0 SHA-1: d61b353e5550aa801f2938f620fb77ab8ab3a28d SHA-256: d9606833cb3d325e7a95fec00702d0929163e1e4ed2d44ca242382aef10c05af
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic. One of the primary links points to a URL that appears to be part of a link farm, and another points to a PDF hosted on AWS. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution via the linked content. No scripts were extracted, but the structure suggests an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/123?utm_term=lg+front+load+washer+dryer+stack PDF link annotation
    • http://lupelisizi.medianewsonline.com/how_to_use_dewalt_3800_psi_pressure_washer.pdfIn PDF document text
    • https://kuxokovu.weebly.com/uploads/1/3/0/7/130738635/3340e7cd82e97ae.pdfIn PDF document text
    • https://pigixona.weebly.com/uploads/1/3/5/9/135986477/busizik.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/ryobi_12_drill_press_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489247/normal_60364e904d79c.pdfIn PDF document text
    • https://wapofowivukixog.weebly.com/uploads/1/3/4/0/134017250/1736277.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5fe51b3367c46.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/20022609918.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/86184783844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473322/normal_5fd228a92574e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369643/normal_60020ccbba756.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/mystery_brain_teaser_puzzles_nz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470387/normal_5fe001dcc392c.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/folexapurilowe/zogeruxobaw.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/guided_meditation_self_healing_pain_relief.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/37522998757.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/26858519334.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/74429756908.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/gekazojetoma.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/national_interest_and_foreign_policy.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_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 5220 bytes
SHA-256: cf2890e5d96e1b35d883e54715e0e97805e4d1f35ba8fcbb19600ea7dbdc206b
font_01_sfnt_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 10864 bytes
SHA-256: 5e2ba7546f711c232a44f7e015d0601fe8168c02338b457c9395850568748b96
font_02_sfnt_off00013143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13143 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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