Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedf1a1db01dcef8…

MALICIOUS

PDF

78.1 KB Created: 2021-03-12 00:37:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 029f5db22177fdb92c3109817215d0ba SHA-1: c0d530d38e84dc64900930ae80e89bba6d067f55 SHA-256: cedf1a1db01dcef856a7534e16240edce3970595b8cbf0bb35463853b1e4fdd4
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://gimoguvi.ru/award?keyword=dental+anesthesia+book+pdf PDF link annotation
    • http://thecabinets.xyz/nanezedanemepudajuvupawowroqr6.pdfIn PDF document text
    • http://parralax.net/744460843151qvl6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_603d3c456b6db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_602b6223a833d.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/ldzwnji/the_sonic_dash_mod_all_characters_unlocked.pdfIn PDF document text
    • https://cdn.sqhk.co/pukikojat/eRiigiV/jilowoxakejuboxugaxuw.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/gjXOzhb/nz_vs_lions.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/ghhjjCP/97386124058.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/jghdgfg/swordsman_of_landstar_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/lesepivir/njfjahh/hungry_dragon_game_review.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/ierknsF/guide_for_stick_war_legacy_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_603ac748d8613.pdfIn PDF document text
    • http://affilateapp.online/dibujogetuparafeocz1g.pdfIn PDF document text
    • http://universe1.space/2894690999ieu83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388835/normal_5fc7c35bd9696.pdfIn PDF document text
    • https://cdn.sqhk.co/nelufebo/gejfiif/hot_wheels_race_off_glow_wheels_game.pdfIn PDF document text
    • http://hopecommunitynaz.com/39827225666y3pw4.pdfIn PDF document text
    • https://cdn.sqhk.co/taxuvoguraji/YVKRHEM/65311895976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445739/normal_5fd3a94fc7dd5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_c68aec6992be4d489ebb6ad45f831f1e.pdf?index=trueIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_c059952fbb0a4bb696ae9ac0b8620020.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_a9aedb200891490096358ea3cddafa92.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_35d56060e849459698130d85a83dd17f.pdf?index=trueIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_e7e77a95fa8041ec886103ff5a90d7b3.pdf?index=trueIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_851a88292ea746f6a6d7b38a0c323a96.pdf?index=trueIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_1b9eb1bf674547c988a2c0154df9962e.pdf?index=trueIn PDF document text
    • https://medlineplus.gov/anesthesia.htmlIn 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_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 5236 bytes
SHA-256: 4dfd20706fcc4fe2ab536ebfe8dc688a8822e061ba8cc4c417874f1a581c466e
font_01_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 11004 bytes
SHA-256: 7a1c751daf7d7b623ab9a0f96f6f168db64baec41c8726c7b55f0e56001689ae

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