Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9de9c343efe6531…

MALICIOUS

PDF

80.4 KB Created: 2021-03-23 04:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 05ba8b234a32170e05b32a5cc8173b96 SHA-1: 7854c008e5ea1dc8dcbca752ad26ad806486cfe5 SHA-256: a9de9c343efe6531b5b7cd1fa9cccd3851f3f8f25402587a070490fc67f63c47
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/strik?utm_term=how+to+adjust+rain+bird+sprinkler+heads PDF link annotation
    • https://cdn.sqhk.co/nuwalimo/ia9igY5/47256157985.pdfIn PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/kitod.pdfIn PDF document text
    • http://normab-id.com/citizen_wr100_eco_drive_blackwc7ul.pdfIn PDF document text
    • http://dalnoboyi.xyz/7552741360n8uft.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/jecjcjA/diy_storage_ideas_for_small_bedrooms.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/niaUWnC/subway_clash_3d_series.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/qghg0z4/bomb_man_game_jar.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/6iegdhc/rebel_inc_cheats_deutsch.pdfIn PDF document text
    • http://wowitaly.pro/vajumejogosanaxtkcmn.pdfIn PDF document text
    • https://zukepuroxile.weebly.com/uploads/1/3/4/7/134746995/gesupezozixufo-genafuj.pdfIn PDF document text
    • http://gratoramaa.space/5662951265898f4v.pdfIn PDF document text
    • https://jikesisepam.weebly.com/uploads/1/3/1/4/131406861/1548947.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_10bd2e7b466044c19373ccbb8467f244.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/polexebuj/esquire_fashion_guide_for_all_occasions.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/50862019660.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_93a0c54503f8496a8eb225416bb0ca52.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/13879120637.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/displacing_indigenous_peoples_questions_and_answers.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_c68b8aed909f4e8db1015f20dd81d72b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/18617100102.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 5264 bytes
SHA-256: 12a0ad71f656999e29bb78661cee9509c386f24b9e4e60b5f2cdd68b1834021d
font_01_sfnt_off0000fe3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 11208 bytes
SHA-256: 350a5765672f7514d66953482ed1d91428a71c1dad299c78e6dd5cbc803d6b33
font_02_sfnt_off000124a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A5 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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