Malicious PDF — malware analysis report

Static analysis result for SHA-256 378b439e5ff6f04a…

MALICIOUS

PDF

83.1 KB Created: 2021-03-09 17:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9d4ba914abfd7a470f282cce7c45638 SHA-1: 5f8106c8aae3a6a1d02b54c3dd2fa2a2ac6883dc SHA-256: 378b439e5ff6f04ad0db3eb221f9e7e99eaf3bda1f98e1508fd725f508ffd2ce
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/award?keyword=ejemplos+de+entidad+relacion+base+de+datos+pdf
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/5331936.pdf
    • https://bolubevegu.weebly.com/uploads/1/3/1/4/131454373/ec99da72adb.pdf
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/kojufifi-luzefivolugub-wilotukilu-fatid.pdf
    • https://cdn.sqhk.co/jasurisunav/eljfgg4/53746185528.pdf
    • http://bigswinner.space/divine_rpg_portals_guide9zy3k.pdf
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/38d040c0820681.pdf
    • http://twirlini.com/18205942942pu1uu.pdf
    • http://finansi-7.online/comparing_and_ordering_real_numbers_worksheet_answersfbotz.pdf
    • https://cdn.sqhk.co/vovomafejuwa/gIWjizG/totakasuvokiguwirivifigum.pdf
    • http://myfirstsite.xyz/xurifobc7f89.pdf
    • http://subumobo.22web.org/word_unscramble_cheat_sheet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lunojol/5064146948.pdf
    • https://s3.amazonaws.com/memexelu/benzoic_acid_chemical_information.pdf
    • https://s3.amazonaws.com/janodojivi/bcbsil_prescription_reimbursement_form.pdf
    • https://s3.amazonaws.com/viboxikuz/note_9_android_pie_gestures.pdf
    • http://tuninedup.epizy.com/49789336932.pdf
    • https://s3.amazonaws.com/pezofut/1139293214.pdf
    • https://s3.amazonaws.com/bibejovixapis/worksheet_4.1b_law_of_conservation_of_energy_answer_key.pdf
    • https://s3.amazonaws.com/tipikaxe/vebufetir.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_off000105a6.bin
40b4fc6e72c1878c2f61308be4a8227d8f53dce6515428f3a20d22f1ce05e1bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A6 5472 bytes
font_01_sfnt_off00011828.bin
b4733193bec2c51eaa93dcea04c3c189b5175fbfcab8afed10b4d8d86276246d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 11304 bytes

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