Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0435c2909a7735…

MALICIOUS

PDF

75.4 KB Created: 2021-04-02 22:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80d899d215e42520fb1fd481fb75cac8 SHA-1: 7319bd4b45137b88004515714ff3988dac6a6349 SHA-256: 1e0435c2909a7735d30d52a88d0fa5f06bc0eb637b8d635c58b4d6958823d3d8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to a resource for Instagram followers and likes. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded links suggests an attempt to redirect the user to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/wix?keyword=hashtagsmix+get+instagram+followers+and+likes+apk
    • http://vedice.ru/99663066413qrs09.pdf
    • https://wumibatolazonik.weebly.com/uploads/1/3/1/4/131437616/6407950.pdf
    • https://cdn.sqhk.co/kusewupudin/2hijbUy/1424915197.pdf
    • https://cdn-cms.f-static.net/uploads/4446635/normal_60560cd93ee1f.pdf
    • https://cdn.sqhk.co/xuxiropuwomo/ZKuggZk/blank_world_political_map.pdf
    • https://cdn.sqhk.co/bapisolel/ijieyjh/top_up_mobile_recharge_24_7_pondicherry.pdf
    • http://copyright-securityx.com/the_little_prince_french_bookfm9lb.pdf
    • https://fenatafu.weebly.com/uploads/1/3/1/6/131637570/4694836.pdf
    • https://cdn-cms.f-static.net/uploads/4369191/normal_5fea45459763b.pdf
    • http://werenntaq.online/how_to_install_hp_officejet_6500_wirelessc8n58.pdf
    • https://tavutafaj.weebly.com/uploads/1/3/1/4/131482866/jipesoxegil.pdf
    • https://guxosenenizezov.weebly.com/uploads/1/3/4/5/134598055/sazujesunonufan.pdf
    • https://zusabave.weebly.com/uploads/1/3/1/4/131406295/kerakuzikisefolufal.pdf
    • http://islandlandscapesbb.com/14606186451cni3f.pdf
    • https://cdn.sqhk.co/ratosakip/Gighjci/7742581179.pdf
    • https://nefositasin.weebly.com/uploads/1/3/4/3/134310380/aa91c1d.pdf
    • https://cdn.sqhk.co/daguvemet/gdRL0Cz/animated_bible_stories_from_the_old_testament.pdf
    • https://jipuziloki.weebly.com/uploads/1/3/2/6/132695969/5419626.pdf
    • http://itdiscount.info/wasutesojereregujraotc.pdf
    • https://cdn-cms.f-static.net/uploads/4490001/normal_605c6bd8e362c.pdf
    • https://xanugobolenaz.weebly.com/uploads/1/3/4/3/134371028/piwifevisovoki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7ffc9a3e-d2d2-4ac2-a818-387c43bb5980/how_much_does_computer_programmer_make.pdf
    • https://uploads.strikinglycdn.com/files/29041a86-0549-417d-8942-3f8f9862ca94/78903949111.pdf
    • https://uploads.strikinglycdn.com/files/06ffd71e-5926-4410-8ade-c4f7c560ebcb/tusuzutapetep.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_off0000e71f.bin
beb2d965c1ebd24e6925477b65a3f4d508aeba277ebdd2dd983a31bb74671d9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 5640 bytes
font_01_sfnt_off0000fa43.bin
ef2ab2dd0b3dbc437d3155b8021b30446fe483009373ca8edb89bb094e66157e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 10848 bytes