Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4bf01a38380090…

MALICIOUS

PDF

74.5 KB Created: 2021-05-17 10:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d06c224e82e5e7ba15360b1a57bd9bf8 SHA-1: b567bbf2bcd056ac0310b024f5aa89cae584be59 SHA-256: bd4bf01a3838009018836088ede0d0d82ebd64616915a2aaaf62687fe4c45003
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9999

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://gimoguvi.ru/strik?utm_term=how+to+ignore+guy+friend PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452618/normal_5fd94a9e87430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486983/normal_60512c5908ce0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486763/normal_602eb52a0178e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_6011dc343ac45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369162/normal_602fb675e7d9b.pdfIn PDF document text
    • http://zekuweteg.iblogger.org/jomaxerebe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://solazagu.epizy.com/nepefiposezikun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e887807c-057d-4a6a-837c-33658e053259/ap_english_4_vocabulary_words.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/fegase.pdfIn PDF document text
    • http://pasobopupolom.rf.gd/godusorepizunewazijegalu.pdfIn PDF document text
    • https://764dfaed-7091-4b1c-a8ff-ceb5b694923f.filesusr.com/ugd/4bafdb_a0cbd38821804fbc941ad53f9dc2b15b.pdf?index=trueIn PDF document text
    • https://9177b9cb-4c70-42bd-a9e0-27a1bf53b67b.filesusr.com/ugd/9baf76_03524e91e230435c8cb823e7478f8c5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/280862cf-1699-4248-be41-d247b25fc96d/the_analysis_and_design_of_linear_circuits_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d68e63c-a16b-4fea-8db2-ba3d1c25a66e/sullivan_algebra_and_trigonometry_10th_edition_slader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c653b2-9b61-4277-ad8c-ac8b59faf279/best_english_speaking_course_in_hindi.pdfIn PDF document text
    • http://tavamikilav.myartsonline.com/stand_meaning_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da048547-3313-4fb1-8694-8171158d4e0d/89276983759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ddfb39-9ea6-47a8-9e55-a3489dbe7ff0/jopenexejurofosepirunova.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_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 4812 bytes
SHA-256: 9d68435746d0f6a54965c9159f9d5db7bd3f3bcaa0ab32297c68452cdc431f65
font_01_sfnt_off0000fa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA05 10348 bytes
SHA-256: fba78b86694b4f40e405984bc0550bc88802f84543bb5f66926bf8a1f2e5054a

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