Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b230378ef50920…

MALICIOUS

PDF

88.5 KB Created: 2021-03-17 19:22:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3c99e764ae0cba7809271b17d3a2f3ad SHA-1: 58d1a7138680e3ac7074c57404ac140505f9579b SHA-256: b8b230378ef509202e9d746fab2aecf51c577de6fdc519de8613721226fd4e44
236 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing and a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/dedewamozexavez_tewodaraxuve.pdf.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wix?keyword=cobb+county+arrests+june+2020 PDF link annotation
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/dedewamozexavez_tewodaraxuve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5fe6f2e830f6d.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/zojaluwegivoxa_majirovog.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/ziguvusexerozuje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_600c41350cfa6.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwebobit/2X4aqie/49614630325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470220/normal_5fd68a3452033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_601c67ff4b856.pdfIn PDF document text
    • https://cdn.sqhk.co/gasalikuviz/agfXibk/mifexuwifumepo.pdfIn PDF document text
    • https://cdn.sqhk.co/buzovegom/ijdhjgT/60828415968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_5fd6381b846ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b942a0-333d-4fda-9fec-d63cdccbec47/kuninim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe703ec-7790-4736-9258-e3091eb1a995/whirlpool_wmh31017as_microwave_oven_light_bulb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac635a71-6117-4645-9b2e-a922fe9bf83f/ralph_ellison_invisible_man_prologue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c304b788-4d81-45db-adef-b06c2c5226b8/the_christian_atheist_bible_study.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf5e1e6a-99c4-4e56-8686-e79156a8b5d0/how_do_i_change_the_wifi_on_my_harmony_hub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35ab48b-6387-4781-ae47-8454198adab9/21743925636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0afbae67-5204-4ac9-a6ea-80f7163dcdab/what_is_the_point_of_meditation_in_buddhism.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_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 5260 bytes
SHA-256: e31e145a8d6cb593918bc3721d0afef0406b11a0c7ef59bf13cd21b7b863ace1
font_01_sfnt_off00012e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E44 10788 bytes
SHA-256: 5f8354495a1218981302cc52aeed39e5a4713f09a1b018ad73212da8d675a02a

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