Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e32727faa6530d…

MALICIOUS

PDF

85.2 KB Created: 2021-03-15 05:28:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c32092a551554ed743a6efddcb1a9344 SHA-1: 3170be70e30ff7f520b4ad849ea4d4b932ccaeae SHA-256: c9e32727faa6530da31744ef155c1cfa5494d7f292834a149cd38d7d8301d72e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm', suggesting a phishing or SEO poisoning attack. ClamAV detection and ML classification confirm its malicious nature. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

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://jacksth.ru/award?keyword=personality+disorders+psychology+pdf
    • http://faketikus.22web.org/ragab.pdf
    • https://sefariduzaki.weebly.com/uploads/1/3/4/6/134665623/soviwuxewanorav.pdf
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/fd7447.pdf
    • https://foziwumiwogesis.weebly.com/uploads/1/3/5/3/135321673/2760639.pdf
    • https://xibemorebag.weebly.com/uploads/1/3/4/3/134355918/5994784.pdf
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/fazamowuvapamisuf.pdf
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/jakeg.pdf
    • http://polnews.xyz/advanced_accounting_theory_and_practice76r0v.pdf
    • http://sufevar.22web.org/how_to_replace_igniter_on_weber_grill.pdf
    • https://minedikatew.weebly.com/uploads/1/3/0/7/130739540/e68fad8b34ba80.pdf
    • http://igcopyrightverify.com/what_is_the_weight_limit_on_a_15_foot_trampolinen4rsr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rikulovesemura.rf.gd/16982188033.pdf
    • https://s3.amazonaws.com/muvemasoxaji/minalevolonepafomojudeza.pdf
    • http://gezexibubaju.rf.gd/hiv_treatment_guidelines_opportunistic_infections.pdf
    • https://s3.amazonaws.com/varoximu/67368191182.pdf
    • http://jefiwimagi.epizy.com/is_plc_easy_to_learn.pdf
    • https://s3.amazonaws.com/kawotexulozax/bhangra_songs_2018_free.pdf
    • https://s3.amazonaws.com/davolazupivowi/zojogux.pdf
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_ccd98b558140428b97a4aecfc04a0e53.pdf?index=true
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_6ac76d1f89744b03985d1de682a212b5.pdf?index=true
    • 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_off00011044.bin
b38c2f4450adcc7bcf03bd8ee2831533b58fcdbae19f2a719f4fd74b76cfe4d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 5520 bytes
font_01_sfnt_off0001230e.bin
ccfa706bfc83ff8dd46aa78779e17badb94b10a7f92577c27b8e017599fc43a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 10696 bytes

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