Malicious PDF — malware analysis report

Static analysis result for SHA-256 f652e1a20258ce31…

MALICIOUS

PDF

75.3 KB Created: 2021-04-01 22:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc14746914dcd48a7b6942c0c4324279 SHA-1: d48d5b17fcd46719c0736776177040e7f26fd08e SHA-256: f652e1a20258ce313deb8a2bec5a728266d3555ae455580f75506ad4f00105f1
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 point to other PDFs, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign designed to redirect users to malicious 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-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://ponafet.ru/award?keyword=teaching+approaches+and+strategies+pdf
    • https://cdn.sqhk.co/lupokuna/gg8hahc/20198888867.pdf
    • https://cdn.sqhk.co/vinasujitupe/fwijjje/38771670921.pdf
    • https://judumufef.weebly.com/uploads/1/3/0/7/130738812/8b9ee5a043.pdf
    • http://nibajafij.medianewsonline.com/tipos_de_cadenas_troficas.pdf
    • http://xemokajoled.medianewsonline.com/58110846958.pdf
    • https://cdn.sqhk.co/bunewonu/HiegiOl/gezirimijetetoxurap.pdf
    • https://ronikirene.weebly.com/uploads/1/3/5/3/135393313/6972830.pdf
    • https://cdn.sqhk.co/gusisitixinu/jbFih6X/lockdown_brawl_battle_royale_card_duel_arena_ccgs.pdf
    • https://wokawopirajer.weebly.com/uploads/1/3/3/9/133999547/ludol.pdf
    • https://zatuduxe.weebly.com/uploads/1/3/4/5/134595584/dotopulez.pdf
    • https://cdn.sqhk.co/jawefujivi/g6K5rYu/robuto.pdf
    • https://cdn.sqhk.co/pajubopolak/1dhgLie/sonutuvajovutiviwamese.pdf
    • https://lovevupadu.weebly.com/uploads/1/3/5/3/135328586/vadejutosesexut-dafujirotakofim-xizabev-xikapenaril.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vonutavekip/arbor_acres_broiler_manual.pdf
    • https://s3.amazonaws.com/bopuxosavubare/79689580662.pdf
    • http://duxepivol.myartsonline.com/nemafukabipixom.pdf
    • http://wepogevadapafa.atwebpages.com/24679382521.pdf
    • http://lelikerakovet.atwebpages.com/96834695955.pdf
    • https://s3.amazonaws.com/gozilum/79623152122.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_off0000e6bb.bin
f62c6334ba6c7174892b0ce17b0fa85da63e370ff2056c77eb1adf04c322c066
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BB 5332 bytes
font_01_sfnt_off0000f8d6.bin
615cb3a44ba0851855cc105817b9542d81345c7659f86974c07bfb9e2b5ed1c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 10836 bytes