Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8f222b120aabd5…

MALICIOUS

PDF

95.3 KB Created: 2021-02-13 10:52:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4ad1c90c3441d0894b33bffa05e55ad9 SHA-1: 206d34a1f1158c1b2bc15271e2c134e894f925a1 SHA-256: bf8f222b120aabd598f71a39990d99b8ab673192a700721cfbd09c11f2285864
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as search results or document titles, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection to potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=steve+harrington+stranger+things+quotes PDF link annotation
    • http://fishing-rods2.club/organizational_culture_lecture_notescetbn.pdfIn PDF document text
    • https://pepulumowuso.weebly.com/uploads/1/3/2/6/132681954/465a6a274ec.pdfIn PDF document text
    • http://opit.space/candy_crush_friends_saga_apk_android_1woyow.pdfIn PDF document text
    • http://skidki-day.store/papajajarelixorazelb4ez0.pdfIn PDF document text
    • https://sokuvefababadax.weebly.com/uploads/1/3/1/8/131856373/2cd3c30b.pdfIn PDF document text
    • http://samyog.ru/wabibovakodixim920jx.pdfIn PDF document text
    • http://wisecredit.info/happy_wheels_free_full_gamed8ji5.pdfIn PDF document text
    • https://gikositaga.weebly.com/uploads/1/3/4/7/134773380/zonosisejifiw.pdfIn PDF document text
    • http://varnisvakq.ru/asphalt_nitro_hack_for_pcwve35.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/sojuravewi/10930349685.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/virginia_dmv_driving_test_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/warriors_clippers_injury_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/example_of_annotated_bibliography_mla_format.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/66764939404.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_off000135f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F7 5204 bytes
SHA-256: bc8b3b56ddb5c4fa3e80b7f7dbd8231e0adc2892f5ef16616fc94a0256737831
font_01_sfnt_off000147aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AA 11384 bytes
SHA-256: 6d0cb88a407de788a297801735a7ecf332a2a5dee44737aec864d06685ff4371

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