Malicious PDF — malware analysis report

Static analysis result for SHA-256 323176fded5ee88f…

MALICIOUS

PDF

75.8 KB Created: 2021-04-05 16:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 02f47e5ce71a03318d44dd00e2065467 SHA-1: 1d3c7d12f4ef0edf660af7010bd44018bd30d4ec SHA-256: 323176fded5ee88f18b9dab6d8d9273b6bf36d069ee5ba95bbf4ed2cd9f4826b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to SEO-optimized PDF files, suggesting a link farm or content manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://vilenefex.ru/award?keyword=belt+conveyor+system+pdf PDF link annotation
    • https://cdn.sqhk.co/sadisadaz/ijagdHC/angle_addition_postulate_worksheet_kuta_software.pdfIn PDF document text
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/dajojuk_kositorupi_befaniginupu_botiroge.pdfIn PDF document text
    • https://batebabegusuk.weebly.com/uploads/1/3/1/4/131437625/vibemur_semisox_basirira_rirusu.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/sihfHk8/elements_of_art_shape_drawings.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/ZNqUhej/tiny_archers_old_version_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/best_way_to_get_rid_of_poison_ivy_rash_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14362f45-59ce-4a19-890d-3fd59c95823f/what_is_difference_between_project_leader_and_project_manager.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_fa109bf41be74730bef3a86b662977af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/ringtone_song_tik_tok.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/vacation_itinerary_template_google_docs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9b6b54-8df0-4612-98db-60efa37160b9/64456658794.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/luguzirididajiwerovedopez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b221ecb2-4f95-48e3-bd17-605fcd6b037a/28357007055.pdfIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_0c4035d947224d238a6b5dd5c0c587c6.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_6c88348e60814b5f9502b542ead956ad.pdf?index=trueIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_534dd6ed2c4c48dd885edb54bcdd7112.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/laginekux/64080937869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6167281f-9c0f-47a3-8721-507701bf1409/20433523192.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_f8254d6aeec140739901896581217392.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_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 5304 bytes
SHA-256: 80304505006933afe10f519011a4da38582323fde521a233f12267d35945f6e4
font_01_sfnt_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 11292 bytes
SHA-256: bfaa143b676a1c271855d9525471f8697e70c859c11257d5fa2aaf71e5786d40

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