Malicious PDF — malware analysis report

Static analysis result for SHA-256 46aa3b37e7f978b2…

MALICIOUS

PDF

78.1 KB Created: 2021-04-23 14:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d20d13e83bbcdb164f25d47937ee23b5 SHA-1: e71193bffc53be42a7f3ed761d1e1347efee064a SHA-256: 46aa3b37e7f978b2b8da77a3cb51af6840e75a99714e7b00eaa8f917ddca150c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as book titles, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, but the presence of numerous external URIs points to a social engineering attack.

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://zajinet.ru/strik?utm_term=best+drug+book+for+nurses
    • https://cdn.sqhk.co/ginijetemepa/djjljhj/wrong_turn_7_movie_free_480p.pdf
    • https://cdn.sqhk.co/kezinujus/jhjdErH/98860257665.pdf
    • https://cdn.sqhk.co/gisatajofo/h8LRsjc/viwiguz.pdf
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/wenavup-fanajojuwaxa-simidewogana-wevenidotarox.pdf
    • http://spainsale.pro/optical_illusion_art_easyqhob5.pdf
    • http://kilekapalovuzo.getenjoyment.net/bookkeeping_tutorial.pdf
    • https://kipigifusulip.weebly.com/uploads/1/3/4/4/134437712/jomuperaf.pdf
    • http://xafopawiki.medianewsonline.com/19494729684.pdf
    • https://cdn.sqhk.co/sativomofij/heaBBW3/91161324035.pdf
    • https://static.s123-cdn-static.com/uploads/4471099/normal_5feb86cce71ad.pdf
    • https://cdn-cms.f-static.net/uploads/4409250/normal_605fd719d8189.pdf
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/7aa1658933ae2.pdf
    • http://sodalabs.club/kokebeduloxiri4mo4b.pdf
    • http://naykaryadom.fun/network_topology_powerpoint_templaten3gmf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8878118c-82b5-44b4-930d-940c3428542b/mtd_snowblower_maintenance_manual.pdf
    • https://uploads.strikinglycdn.com/files/a347ac3c-f2d7-497b-b38f-92186f544c9d/94895309701.pdf
    • https://uploads.strikinglycdn.com/files/4c8da8ab-b0e2-4432-80df-6444bc9ac77a/nozavorasakapujoxideles.pdf
    • https://uploads.strikinglycdn.com/files/59acaa2d-be06-4841-aecb-3a98c5c788ce/el_amor_en_los_tiempos_del_clera_resumen_corto.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_off0000f37a.bin
c70585e6949c8f1bbb69fb451d6b4a024e446387a110df85c1f86f484ff9699d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 5084 bytes
font_01_sfnt_off000104df.bin
a0f885407f3eccdf41864e6054b76184c620ab708bcf8a14ab0704e77f280133		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 11460 bytes

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