Malicious PDF — malware analysis report

Static analysis result for SHA-256 5935d62cbe8b2f5c…

MALICIOUS

PDF

81.4 KB Created: 2021-05-13 07:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d1cd3973e67efc668a6d5477185b0034 SHA-1: ee236cf1683a118aa7688d13b52590edc576a388 SHA-256: 5935d62cbe8b2f5c820fca940c8e1631b22791821619e34c200650d36edb0e7a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of embedded URLs and the overall structure indicate an attempt to lure users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=meade+%2523497+autostar+computer+controller+manual PDF link annotation
    • https://fukorolavo.weebly.com/uploads/1/3/4/6/134639224/ca628fcd.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/jjjjdib/splendor_in_the_grass_1981_tv_movie.pdfIn PDF document text
    • http://airet.space/208654278714sjli.pdfIn PDF document text
    • https://tosulabemolajeg.weebly.com/uploads/1/3/1/8/131871730/pulavaligago.pdfIn PDF document text
    • http://blockhcain.host/glacier_bay_pull_out_kitchen_faucet_repairvbwlf.pdfIn PDF document text
    • https://cdn.sqhk.co/vateviti/diaXji9/najimubebowoluzixodozu.pdfIn PDF document text
    • http://helper-badges.com/bizifibons847q.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/gugadum-bigefomunomid-vewaki-wulusogoso.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/aiak1ji/dark_knight_idle_rpg_games.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/2009_cobalt_ss_maintenance_schedulejb5hw.pdfIn PDF document text
    • http://yourbigdick.space/laxunamekiguwowu66n4t.pdfIn PDF document text
    • http://world-wildshop.com/xitumux0yhk.pdfIn PDF document text
    • http://itclick.info/57543518812a9u4s.pdfIn PDF document text
    • https://xoxawipexari.weebly.com/uploads/1/3/0/7/130775732/aecfa50ef1db6.pdfIn PDF document text
    • https://gegosituvoxefo.weebly.com/uploads/1/3/5/3/135349754/2625954.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/vuluvomixozan-ninazazuw-bebedefitizuba.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/gibaloma_jixawivudoziso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9202870b-1c74-4ad3-9d5d-757cecd9e06e/hydrological_cycle_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a03088-f640-42da-9242-2d31561615b9/jevelimekipisududibinafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c00ec3e-dfff-40a0-a553-610e02b1b98a/how_to_pray_the_rosary_prayer_cards.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 4512 bytes
SHA-256: ab94bd49d0e6a4b10f199bfccad35e2c759f03062adfebd561f8ceeaa7759cff
font_01_sfnt_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 11108 bytes
SHA-256: 3e2aa79c33f9f72f041c899383cc3b3e0acbceecc505a1138fcd1b499230fadb
font_02_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 16088 bytes
SHA-256: a31bcf556e181db077c9b64db679e746f1af4c47e86886feaa6b1c1c5ec82d40