Malicious PDF — malware analysis report

Static analysis result for SHA-256 653bb895ed650578…

MALICIOUS

PDF

75.7 KB Created: 2021-04-05 10:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e79977674a5f047bbf91e1dac5a2b44f SHA-1: 6b3f31aefd4398f6dcb08948cf31dd2725bcb5d1 SHA-256: 653bb895ed6505784d1c7eaaa6c3dbe54662e85a18348a11f8426d794c3f39b2
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 dynamically generated and point to potentially malicious domains, indicating a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/award?keyword=bodies+by+rachel+train+like+me+pdf
    • http://ogranicbio.fun/lisukikadegodadijolaxigo775sq.pdf
    • https://fuxiwuzepideka.weebly.com/uploads/1/3/1/3/131381491/2dc841b3.pdf
    • https://rolarijigajegij.weebly.com/uploads/1/3/1/4/131438579/2920678.pdf
    • https://nonibebufixaz.weebly.com/uploads/1/3/2/6/132682934/fezigidulilij.pdf
    • http://kaxowamuva.22web.org/alkyl_halide_chapter.pdf
    • http://excschool.ru/rikimey4w7d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dudigonifu/9528071211.pdf
    • https://uploads.strikinglycdn.com/files/074140a0-bcfa-457b-8584-8c5b43034d8c/williams_sonoma_bread_machine_pizza_dough.pdf
    • https://s3.amazonaws.com/lomogas/adobe_flash_player_blocked_chrome_fix.pdf
    • https://uploads.strikinglycdn.com/files/52b4c3c7-323e-4ff7-9e48-9b9cfb48e283/avaya_one-x_communicator_suite_free_download.pdf
    • http://lobusiwogix.rf.gd/kikinokelomulizuzinaxesi.pdf
    • https://s3.amazonaws.com/tulosa/zurotavetizuzuxesibeneni.pdf
    • http://wavuxab.epizy.com/piazzolla_adios_nonino_tango_rhapsody.pdf
    • https://s3.amazonaws.com/debamijizozexo/kitopejiwebako.pdf
    • https://uploads.strikinglycdn.com/files/2496da48-3cb6-4616-a350-d9f6b874243e/bissell_vacuum_cleaner_bags_style_7.pdf
    • http://butadiviwev.rf.gd/62547011912.pdf
    • https://s3.amazonaws.com/zusevamasor/honeywell_vista_20p_installation_guide.pdf
    • https://uploads.strikinglycdn.com/files/a7ac42f6-6f9a-4e48-9fd2-ebab8af1b449/txdot_hydraulic_design_criteria.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d548.bin
8915239439aff82ac90c1b20a85443109488b1f583c43a8c0ddaab789319e6f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 5748 bytes
font_01_sfnt_off0000e8b2.bin
c15b0f2ae57551eb4af13b1584a83dd47bac313cc7fd90277f26c426c26a834b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 10288 bytes
font_02_sfnt_off00010c30.bin
4b52fd5da643d9c08cc0a86f773b2f024e3274f3f861dfcac100db1ef433cf06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 16164 bytes

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