Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc30f519aaad40f…

MALICIOUS

PDF

84.3 KB Created: 2021-03-30 15:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6350838d004e00e10cfadaab83ee6341 SHA-1: d4043157a246d7a8f45d4e9958d47f5c77f5abd2 SHA-256: abc30f519aaad40f4f427d1e22c02670470d0efa79116b7bf9d4aab7eece2832
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-themed and point to other PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=rationality+in+decision+making+pdf
    • http://pasiworuwiwoz.getenjoyment.net/tb_meningitis_complications.pdf
    • http://lanizimugigil.getenjoyment.net/57548548711.pdf
    • https://cdn.sqhk.co/vabalogu/hibhghe/86589975381.pdf
    • https://cdn.sqhk.co/sifolilo/fEKjbDj/sotulabuvesuzutukilit.pdf
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/janonif.pdf
    • https://cdn.sqhk.co/futevanu/FKribsg/mifexefi.pdf
    • https://cdn.sqhk.co/wimedizi/ghhjhgd/94834567528.pdf
    • https://cdn.sqhk.co/piwizogir/ggidrrN/sidime.pdf
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/433068.pdf
    • http://midarujiwuvi.mygamesonline.org/bartter_syndrome_review.pdf
    • https://cdn.sqhk.co/jifigetuxu/hds35ic/82705094284.pdf
    • https://wabibazo.weebly.com/uploads/1/3/5/2/135295983/wegasoxa-kogibizegubobij.pdf
    • https://cdn-cms.f-static.net/uploads/4382952/normal_5fdad6a986059.pdf
    • https://static.s123-cdn-static.com/uploads/4452834/normal_5fc90a46d2815.pdf
    • https://farazekij.weebly.com/uploads/1/3/4/3/134379469/7875936.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zuponefi/47300685513.pdf
    • https://s3.amazonaws.com/sepawi/4x4_off_road_jeep_games.pdf
    • https://s3.amazonaws.com/muvarelo/maha_powerex_mh-c9000_manual.pdf
    • http://gajopule.myartsonline.com/what_are_the_4_types_of_cardiovascular_disease.pdf
    • http://xejawaji.myartsonline.com/9010554100.pdf
    • https://s3.amazonaws.com/webipejonavuv/96648644795.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fec1.bin
29a1373605a87ed0f29ae5e67e3c0a169cd34024fc38fa74e4fa0b2c47ed4282		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 5340 bytes
font_01_sfnt_off000110ec.bin
95b06c1ad4cffe8c206f553df479e2765239d9626d0c5a22a684e075ac09a8ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 10704 bytes
font_02_sfnt_off00013564.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13564 4324 bytes

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