Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8f856fa88ed161…

MALICIOUS

PDF

90.7 KB Created: 2021-03-11 08:06:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94114ce7601d25b8a24806c4e4fd84be SHA-1: e3c41c6a57d8d03a109cbdbf25085cf286f8d7e1 SHA-256: 5f8f856fa88ed16144d88ed0c0de7c63bd7fa2e018dda02fd6be1110627cd4b2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized content, suggesting a link farm or spamming operation. The ClamAV detection and ML classifier strongly indicate maliciousness, likely phishing or malware distribution. The embedded URL points to a domain associated with keyword-based redirection, further supporting the phishing or SEO spam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=piano+keys+labeled+with+octave
    • https://cdn.sqhk.co/tiwopaperuv/0idx5QH/simalokifozurikuri.pdf
    • https://cdn.sqhk.co/dojoxuwote/ckklif5/sexasinuk.pdf
    • http://alifan.store/moon_river_ranch_weddingcb0uh.pdf
    • http://spainwow.pro/how_to_play_chess_for_the_beginners8vlro.pdf
    • https://cdn.sqhk.co/zoluxoni/ihfhiLZ/engine_oil_guide_castrol.pdf
    • https://cdn.sqhk.co/tibakekavero/hc7hcTp/kupupixiwovalaresizumilo.pdf
    • http://winclean-shop.space/macos_android_studio_adb_pathlsi5w.pdf
    • http://huaweistoreukr.xyz/361334379641jhsl.pdf
    • http://italystore.pro/9719722163m2nik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zosevid/43931517201.pdf
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_adaf496f038d4ddda449bdd5a9868c51.pdf?index=true
    • https://s3.amazonaws.com/lixasifasi/diabetic_kidney_disease_treatment_guidelines.pdf
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_69a0680f18674e9db0574a03ecb1cdb0.pdf?index=true
    • https://s3.amazonaws.com/pirofopafu/37264611609.pdf
    • https://s3.amazonaws.com/rufonali/boom_shakalaka_boom_boom_ringtone.pdf
    • https://s3.amazonaws.com/navoburarovada/70312258002.pdf
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_40c46a01e41b47a8be56385481822bc9.pdf?index=true
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_d2defd0447e240f891e8f19ac40cd9b1.pdf?index=true
    • https://s3.amazonaws.com/gedesisumi/rabeseduzerizikebimujudez.pdf
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_40c193c7be6d455abafb6c8acc3b851f.pdf?index=true
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_b13141c4b7a749e4bcffc32660e698e0.pdf?index=true
    • https://s3.amazonaws.com/xokebore/hamoodur_rehman_commission_report_in_urdu.pdf
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_72a2abdc999548bb8e881a57b3a82595.pdf?index=true
    • https://s3.amazonaws.com/jizubisetebof/qualified_audit_report_isa.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a32.bin
66d49e1ffe71a5c41f3934699d66bd6840e2ba0edbad11625a7490aabee628e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 5388 bytes
font_01_sfnt_off00011ca7.bin
2c8729012301820230e60cc2f2f9e948bc0633abd272cc16e76114592b30019d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 13532 bytes
font_02_sfnt_off0001484a.bin
184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1484A 16120 bytes

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