Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e78f12e606ba0f…

MALICIOUS

PDF

87.2 KB Created: 2021-03-18 01:13:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72776229a3d397d29862cb9c2ae183b2 SHA-1: 2c7eebbd31e2028c398e79b3d3f3bf83c16f7944 SHA-256: d6e78f12e606ba0f528476a86c0838fb250bc41a3b85fa60d19628bbcaa2df3d
164 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, indicated by the presence of a large number of external links, many of which are SEO-optimized. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/award?keyword=campbell+biology+8th+edition+test+bank+pdf+free
    • https://cdn.sqhk.co/zufutetuwume/evGUhbo/jurowininasatovotefolaja.pdf
    • http://chestlune.online/ozark_trail_rechargeable_led_flashlightvqlj4.pdf
    • https://static.s123-cdn-static.com/uploads/4380871/normal_5fee348633e81.pdf
    • https://cdn.sqhk.co/zewuxumaro/hdQiijg/highway_patrol_office_meridian_ms.pdf
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5fe2a46b4852c.pdf
    • https://cdn.sqhk.co/femokuxajuz/fjdhclp/lannister_family_motto.pdf
    • https://static.s123-cdn-static.com/uploads/4375206/normal_5fee1ff95f821.pdf
    • https://cdn.sqhk.co/tovisegag/aihcjaH/wajunikabolebenebexibetem.pdf
    • https://cdn.sqhk.co/nuzitomizaj/TnjaieB/sizudo.pdf
    • https://cdn.sqhk.co/bikakigiben/cOfiZif/35791826379.pdf
    • http://beststudent.fun/perfect_piano_mod_apk_full_unlockedi2pkb.pdf
    • http://tilosag.mypressonline.com/comparison_between_deterrence_and_incapacitation.pdf
    • https://static.s123-cdn-static.com/uploads/4370560/normal_5feb53bf2cebb.pdf
    • https://wenojobopowegit.weebly.com/uploads/1/3/4/8/134879608/jejomew.pdf
    • https://tajidirubizev.weebly.com/uploads/1/3/0/7/130739153/424564.pdf
    • https://cdn.sqhk.co/gojapawareke/idjgaiP/private_caller_id_number.pdf
    • https://cdn.sqhk.co/wetewajaba/Yidgdhf/jixefo.pdf
    • https://cdn.sqhk.co/vumuwuxa/2jjDFie/biblical_coloring_sheets_for_preschoolers.pdf
    • https://legaxebojidonet.weebly.com/uploads/1/3/0/7/130775342/2d72eb4ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vubelifijam.atwebpages.com/how_to_calculate_for_half_life.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_off00011144.bin
4afe529df53807757b28878c3135b9c67694e38efbe96556429f495b80eee21c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 5860 bytes
font_01_sfnt_off00012505.bin
a4539dffced5131dc870d6465b95ffbe7844c4b858792471f99afb012c42de8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 12704 bytes

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