Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9d38d547130c7c…

MALICIOUS

PDF

82.8 KB Created: 2021-03-08 19:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13e1ea9d6a9985e9ac09684a559e7018 SHA-1: b9664c446f57f4a628dc5f6b977f74d402ae1efd SHA-256: 1c9d38d547130c7cb2d7147162ceaaca8c81a5a615cb60efd5504d3d619679ad
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a suspicious domain, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URI heuristics point towards the document's primary function being to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=preposition+test+class+7
    • https://cdn.sqhk.co/tipefima/fTZjaqp/trivia_crack_2_tower_duel_checkmate.pdf
    • https://cdn.sqhk.co/mamidusidozu/hchdijd/20916890331.pdf
    • http://varomevapaxobud.22web.org/60991825710.pdf
    • https://fejoburu.weebly.com/uploads/1/3/0/8/130813906/zepiwuvomik.pdf
    • https://tezubowaxax.weebly.com/uploads/1/3/4/6/134640868/801373c.pdf
    • https://vojawozusuv.weebly.com/uploads/1/3/1/1/131164351/tugaz-tuwujalemudi-tigof.pdf
    • https://cdn.sqhk.co/lixejudazeza/JTJjdhc/music_landscape_iphone.pdf
    • https://cdn.sqhk.co/sixitigoxeto/dhdii03/hero_strike_3d_hack.pdf
    • https://sojagimizalafar.weebly.com/uploads/1/3/5/3/135317111/kojiberuzijuvatu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/siwixomudit/fuentes_del_derecho_procesal_civil_republica_dominicana.pdf
    • https://s3.amazonaws.com/jaxesabi/wondershare_data_recovery_android_free.pdf
    • https://s3.amazonaws.com/vojapu/bivopekujeva.pdf
    • https://s3.amazonaws.com/fobupojowojon/boscard_template_example.pdf
    • http://julopok.epizy.com/acoustic_guitar_tuner_app_for_android.pdf
    • http://bajobakokela.epizy.com/1644238707.pdf
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_ee69c793d4cf477987c9f6ca41b2dc37.pdf?index=true
    • https://s3.amazonaws.com/vutame/73128414831.pdf
    • http://xewowibaxe.rf.gd/kalibopuvepemaxariluv.pdf
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_b5b63707c9a24426b81c202e84e40b33.pdf?index=true
    • https://s3.amazonaws.com/lezopobigeza/balam_ji_love_you_film.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/accp_guidelines_for_pulmonary_embolism.pdf
    • https://s3.amazonaws.com/gitipelut/numero_para_reportar_fuga_de_gas_natural.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_off0000f344.bin
c825dc716e9edecdf529bda03e566960d300c3c2cb6cbc90ca5bfe9dd365fffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 5008 bytes
font_01_sfnt_off00010461.bin
7e41ed88defac633d39aacfdbb8c4fddcd22ad489b7cd3e4910b48c3a3e6e9fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 10588 bytes
font_02_sfnt_off0001288e.bin
764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1288E 16144 bytes

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