Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ab7a8ae8eeb2f9…

MALICIOUS

PDF

88.3 KB Created: 2021-05-21 15:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53f12a78b935ec481248806230474398 SHA-1: b3932503ff8d39265c9c0b1cdee152dddcce3190 SHA-256: 65ab7a8ae8eeb2f9d0434029ca4d19e37962b72ad92d0595056f3cdef0b7b05b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-optimized PDF hosting sites, indicating a link farm. One prominent URL, 'https://jumiwimov.ru/strik?utm_term=tableau+tutorial+point+pdf+free+download', is directly embedded and likely serves as a lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=tableau+tutorial+point+pdf+free+download
    • https://static.s123-cdn-static.com/uploads/4372074/normal_5fde7354312b8.pdf
    • https://static.s123-cdn-static.com/uploads/4489042/normal_5ff1acca1e149.pdf
    • https://kokezixunilo.weebly.com/uploads/1/3/4/0/134096179/796c56f146dd.pdf
    • https://dotofinadi.weebly.com/uploads/1/3/0/7/130740455/mirulu-nopagobemafum-vinenunoraw.pdf
    • https://static.s123-cdn-static.com/uploads/4417024/normal_5ff145a2caa46.pdf
    • https://static.s123-cdn-static.com/uploads/4377114/normal_60031705c7105.pdf
    • https://cdn-cms.f-static.net/uploads/4467955/normal_605b90f9dd2db.pdf
    • https://cdn-cms.f-static.net/uploads/4378843/normal_6039a6b841145.pdf
    • https://cdn-cms.f-static.net/uploads/4490128/normal_5fe913514deb4.pdf
    • https://cdn-cms.f-static.net/uploads/4370263/normal_60362a6f6b731.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fomudebipefasu/ausentismo_laboral.pdf
    • https://s3.amazonaws.com/pexodugosa/who_dies_in_yttd.pdf
    • https://s3.amazonaws.com/timeziso/urdu_videos_songs_free.pdf
    • https://s3.amazonaws.com/zaxefemebidaz/davesiduzeje.pdf
    • https://s3.amazonaws.com/fovezewi/47541720377.pdf
    • https://s3.amazonaws.com/musoxifuvitalo/48633175928.pdf
    • https://s3.amazonaws.com/remuv/phet_molecular_shapes_vsepr_answer_key.pdf
    • https://s3.amazonaws.com/befarekogol/legend_book_by_marie_lu_movie.pdf
    • https://s3.amazonaws.com/vosimalume/zokenijut.pdf
    • https://s3.amazonaws.com/dujepav/illustrator_templates_for_infographics.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001185e.bin
ea4a93dd6a07cd85d6d553963c9ecab9c10747a7220bba5719a603c80d0b38d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 5040 bytes
font_01_sfnt_off0001299c.bin
16d263590fcb655f1ad54a5cee32e37f9ff00c2073c81e429c7c775b94c8b391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1299C 11868 bytes

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