Malicious PDF — malware analysis report

Static analysis result for SHA-256 664d27cc65527e45…

MALICIOUS

PDF

80.3 KB Created: 2021-04-01 05:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ef2fd927f0017b19539f6cc4b8ce5b46 SHA-1: 0e10ab56a82a7f2fe8fc335087ccebf6094cfa06 SHA-256: 664d27cc65527e45fb3c33a99459318b3b4fc8bdedc6f54883b7a3df12bc4ac6
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing or link farm attack, as indicated by the high number of external links and the use of disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links points towards a T1566.001 (Spearphishing Attachment) attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=android+9+pie+black+theme PDF link annotation
    • http://texoraw.sportsontheweb.net/netejisozotikejegamul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_5fd70fa845538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417827/normal_6054019c68e6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_601b50599e34f.pdfIn PDF document text
    • http://kijumubafenu.mypressonline.com/monthly_panchang_calendar_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/gfgdZAD/72902270180.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488135/normal_5fcf3ebb404c3.pdfIn PDF document text
    • https://cdn.sqhk.co/bibolaned/YmzjbRs/instachat_login_with_facebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452169/normal_60380716e131f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420028/normal_5fe08f33e0eb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494674/normal_600bc66ca5bf8.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/cvhjhE3/mini_golf_3d_farm_stars_battle_royale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_6028092ec35ef.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/2UEhfii/gedoberaxozalaleniginof.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/ZJhiids/wopixipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_fcbc594c9f124c0ca337992294e2ade9.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_6c478b53e0164693a565d39e175876ad.pdf?index=trueIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_596c51fe80bf4f71bf343c40ba56fb0a.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_ddc72da00f164bca8bc764f4fb6fe2dc.pdf?index=trueIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_247670b171c6424394535cc0326bed60.pdf?index=trueIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_e4f1c1af4140438ca4b715eeff752f99.pdf?index=trueIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_01dbe0a3bb044a1da91051ca7fbf42a0.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 5484 bytes
SHA-256: 99bc6fde82653db2402ab0d66c4ce895b745fa060dc577c073374b719a1ca61e
font_01_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 11684 bytes
SHA-256: a9d396807e3799c013c9724f4321e76f66f5a723f2cfba77adbefb7b15355438