Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92950f0575b2f94…

MALICIOUS

PDF

79.9 KB Created: 2021-03-30 09:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9a296f9a2736daeb5406da40e261b40 SHA-1: 5283f867d5a5820531b0137d16bfb17eaa0cb629 SHA-256: a92950f0575b2f945ca4b020375c18a02436318f5ff6592acc0b0601a040ef2b
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 potentially malicious files, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to host or redirect to malware payloads.

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://midufefew.ru/award?keyword=oxford+dictionary+english+to+urdu+pdf+download
    • https://cdn.sqhk.co/jenotonolo/4haXjaw/zombie_roadkill_hacked_apk.pdf
    • http://zesenadozefut.sportsontheweb.net/principles_of_genetics_by_gardner_download.pdf
    • https://cdn.sqhk.co/tavimuxeju/QHBijc0/surf_report_hapuna_beach_hawaii.pdf
    • https://cdn.sqhk.co/jalizovi/rgejihC/mujebijowufex.pdf
    • https://cdn.sqhk.co/bowazeduz/ijbghJm/48291325582.pdf
    • https://cdn.sqhk.co/tajudozizif/g1G2hhh/gsea_ranked_lists.pdf
    • http://zonitupupafof.sportsontheweb.net/cdf_and_formula.pdf
    • https://static.s123-cdn-static.com/uploads/4485157/normal_5ffacc6c5c5fa.pdf
    • https://cdn.sqhk.co/mumaxeje/hJqbWW0/simile_worksheets_grade_5.pdf
    • https://cdn-cms.f-static.net/uploads/4369508/normal_604220e084f02.pdf
    • http://tomokatixo.mygamesonline.org/aha_acls_textbook.pdf
    • http://wijutomotagam.mypressonline.com/52189628142.pdf
    • https://cdn-cms.f-static.net/uploads/4470521/normal_6046f7450864d.pdf
    • https://cdn.sqhk.co/jiwejujorod/Rghihif/zatinuvofibomuwagewapu.pdf
    • https://cdn-cms.f-static.net/uploads/4465564/normal_60107a4826ab6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/44fcd419-6ff6-47a4-a9d4-8eca05114a1a/17693411119.pdf
    • http://zirutabu.myartsonline.com/assistant_principal_letter_of_interest.pdf
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_67a1dd941dac4d5292c254dd7b4a9e83.pdf?index=true
    • https://uploads.strikinglycdn.com/files/45f8746f-4eeb-48c3-ac93-89a57ba28037/dbms_stats.gather_table_stats_example_12c.pdf
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_5c358a235fc34c1a90162b5fddba2e0d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e2b52865-5513-474a-b08c-5e17720bb397/kuvazizasuzujadufox.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f76e.bin
813f9d467066437257650e1015028998d8a7aa9db22c47876b43d18bb49cd9ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 5704 bytes
font_01_sfnt_off00010aec.bin
cad26910fab71c64abc1393ffeb1a4063e8573c4f6f7741b9b7c7408f4ef00d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 11556 bytes

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