Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c8a0d9a2e353de…

MALICIOUS

PDF

77.8 KB Created: 2021-03-22 19:22:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c097d714dfff6a080522a0ab4e92dac SHA-1: 7655453eabdfd204e2f75e95bda1b7f0d379dd55 SHA-256: 22c8a0d9a2e353de9cbebf0fd2f8d871546b4aab6335feda563a35e9cd12c84d
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 are to other PDFs, suggesting a link farm or SEO spamming tactic. The ML classifier and ClamAV both strongly indicate maliciousness. The primary malicious URL identified is "https://gimoguvi.ru/award?keyword=legal+dictionary+online+pdf", which is likely used to distribute further payloads or phish users.

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-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://gimoguvi.ru/award?keyword=legal+dictionary+online+pdf
    • https://cdn-cms.f-static.net/uploads/4374520/normal_6046d4adeea1e.pdf
    • https://cdn-cms.f-static.net/uploads/4407807/normal_600e30c06513f.pdf
    • https://cdn.sqhk.co/mozedizupi/jGNjgCn/dakepekukizetiwudokafov.pdf
    • http://natimivenekixu.22web.org/ego_21_in._manual-push_lawn_mower_lm2101.pdf
    • https://cdn.sqhk.co/lapefuxolu/AVc8Fhf/33632414139.pdf
    • https://cdn.sqhk.co/tojofelekob/Pqbdijy/blue_cross_blue_shield_florida_phone_number.pdf
    • https://cdn.sqhk.co/farafakilof/hfUf4nz/green_bay_packers_game_time.pdf
    • https://cdn-cms.f-static.net/uploads/4405190/normal_604e8c48352ce.pdf
    • https://cdn.sqhk.co/ramazunor/spZhfip/83404011558.pdf
    • https://cdn.sqhk.co/moxofudifafi/sijicz0/super_sniper_game_download.pdf
    • http://mawiratuwulu.iblogger.org/bible_commentary_old_testament.pdf
    • https://cdn.sqhk.co/guzowozuk/cSgfUhf/pikmi_pops_giant_flips_kessie_the_cat.pdf
    • https://static.s123-cdn-static.com/uploads/4488332/normal_5ff934fc5c711.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b8c0688d-9346-4bf4-bc2f-d2767148b8ed/taretor.pdf
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_062c104e3e4848689e970af69c58d851.pdf?index=true
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_f029eb5c83f64feb935f5ff17021353b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/68711896-3e9c-4b86-a87a-e12e2fd59c96/nedesovapefujolaguji.pdf
    • https://e19809cf-df80-48c1-9975-8599b001ad7a.filesusr.com/ugd/062cdf_30062e0316454086899d9af1042e609a.pdf?index=true
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_4b602dd5e6584b2d9f50d166c4f18afd.pdf?index=true
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_cf3d3d3eb5f14144a27e271f47e23356.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e8fc825a-e66f-41f6-9b4f-bf8a4da73157/how_do_i_access_voicemail_on_my_cisco_phone.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_off0000f3a4.bin
c7e6949beab605a17380f3f787f3dc4d0a8d52cda5b9247eb87ab49ec9bfd133		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 5188 bytes
font_01_sfnt_off0001056c.bin
ddaa3fb873b170eb4c467e61f054dde40022cc08d4f1b7037022b77cc8ce7e7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 10720 bytes

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