Malicious PDF — malware analysis report

Static analysis result for SHA-256 841cbb0c127edb50…

MALICIOUS

PDF

73.0 KB Created: 2021-04-06 09:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3ab6f2e20b1f88a0a306d78ad9e38f1 SHA-1: 7c61b5283453c38a908eeab95d2cbce2ed567efe SHA-256: 841cbb0c127edb50a90a3a57fa2bcdc19f62aa1c757ae1a00c69d0e739eb036e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a likely attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=your+name+imdb+parents+guide
    • https://cdn.sqhk.co/kufalavoxig/6zIjchb/67420822245.pdf
    • http://olipaka.xyz/19679223746gcdy8.pdf
    • https://cdn.sqhk.co/woxutonezem/6ihQBR8/kanuwumugasiw.pdf
    • https://cdn.sqhk.co/mukujoripu/is2tkAu/teacher_aide_certification_texas.pdf
    • https://cdn-cms.f-static.net/uploads/4415951/normal_601cb976aaa43.pdf
    • https://cdn.sqhk.co/sarimotel/9jfjh8o/44320934165.pdf
    • http://tevubirufizibun.iblogger.org/xamumigujokibob.pdf
    • http://sigefolaxapuve.22web.org/amelie_piano_easy.pdf
    • https://cdn.sqhk.co/gabazumad/bjE8gjf/3d_optical_illusion_t_shirt.pdf
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5fd66132a2cdf.pdf
    • https://cdn.sqhk.co/soxesemu/gujeJRu/teppanyaki_grill_near_me.pdf
    • http://ita-bio.fun/ccna_self_study_or_coursexw0f4.pdf
    • https://cdn-cms.f-static.net/uploads/4366032/normal_6038374456fef.pdf
    • http://shop-profildoors.ru/rifakevizetejidiotphd.pdf
    • https://cdn.sqhk.co/vekudaselux/a8Wifgi/camerafi_live_alternative.pdf
    • http://wamagobegufif.iblogger.org/bunny_girl_senpai_light_novel.pdf
    • http://pumejinidekupi.22web.org/java_ap_computer_science_textbook.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_b27c7597ac3448a7b74f13d6b9a5e47a.pdf?index=true
    • http://kujafugakare.epizy.com/broken_angel_hd_video_songs.pdf
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_86066bd751dc4a3d974bb775d2f2e623.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deec.bin
ef68bbae23f280e4435a7401164282425f8f0f008e5c23191670cf266157f7ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 5348 bytes
font_01_sfnt_off0000f100.bin
797172e8c82e4a398819f02227ba3138a5dce1fbb16094851878310d883ddf30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 11280 bytes

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