Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc74537292c20da2…

MALICIOUS

PDF

100.5 KB Created: 2021-05-20 01:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3268a69f3d1278243a5693e5c2ab953c SHA-1: 6839b0874f3a8757659071ffcb2dea7812368ff0 SHA-256: dc74537292c20da29528c7f7809fe528097f8096af30da037d65a7dee734a151
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. One prominent URL is 'https://jumiwimov.ru/strik?utm_term=dls+2019+fcb+hack+profile+dat', which is likely part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=dls+2019+fcb+hack+profile+dat
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/darurukefixufalebipu.pdf
    • https://cdn-cms.f-static.net/uploads/4406812/normal_6024144f21bf6.pdf
    • https://static.s123-cdn-static.com/uploads/4471096/normal_5fe2da7d8d3e9.pdf
    • https://zezojafoxivofed.weebly.com/uploads/1/3/4/5/134528913/601bf8f4d.pdf
    • https://cdn-cms.f-static.net/uploads/4420764/normal_602685419ff86.pdf
    • https://static.s123-cdn-static.com/uploads/4421056/normal_6002735b0f7b4.pdf
    • https://gigorevexi.weebly.com/uploads/1/3/4/7/134714530/62bdb7728.pdf
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/1074566.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/safenalavojuwu/77102416391.pdf
    • https://uploads.strikinglycdn.com/files/d3a923bf-fbf5-4d99-b536-d7109f3dde39/89249805147.pdf
    • https://uploads.strikinglycdn.com/files/779fb9d3-3427-4a2f-8e19-6a67813947af/japusirezonodux.pdf
    • https://uploads.strikinglycdn.com/files/422bb317-dba3-4c4a-88af-3c0cc13ace7f/marvel_comics_unlimited_uk.pdf
    • https://s3.amazonaws.com/lebejos/kuvitebutufi.pdf
    • https://uploads.strikinglycdn.com/files/1a06681d-3abc-45e8-96a2-b3830f6c7ca6/principles_life_and_work_amazon.pdf
    • https://uploads.strikinglycdn.com/files/1ea51a7f-9900-4fc6-bb1b-060679383bde/dog_bow_tie_measurements.pdf
    • https://uploads.strikinglycdn.com/files/bc1ea69c-0876-4f2f-8f97-e79f6addd90c/pomajunewutep.pdf
    • https://uploads.strikinglycdn.com/files/783efdeb-9246-49ac-8c82-53a986809fe4/lukenakirafumemer.pdf
    • https://uploads.strikinglycdn.com/files/90fce7e3-6e54-4834-8cd1-a0a5d2a43ad1/what_is_economic_development_in_geography.pdf
    • https://uploads.strikinglycdn.com/files/0dfff301-3316-44ce-a6ce-f36624afd3d3/towigemoxib.pdf
    • https://uploads.strikinglycdn.com/files/6011f5dc-1edf-48aa-8660-9e73161c98ad/focusrite_scarlett_2i2_1st_gen_vs_2nd_gen_vs_3rd_gen.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001618a.bin
2976e3438dcd03b8b4ae94180aa84934456b599b47aa919c14b1cca0ffc0674a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1618A 20292 bytes
font_00_sfnt_off000121cd.bin
6d3994cd1493223c64fb95ada3147f516856925ab280d95dfca582404d24287a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121CD 5928 bytes
font_01_sfnt_off000135f8.bin
d855acc506141f3436b6dce6840044cc718d0fbc293b31e7c18db213bdc14f08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135F8 13820 bytes

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