Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f5e838b4be103a…

MALICIOUS

PDF

111.8 KB Created: 2020-12-30 21:16:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 57e88613a4045f3ed1fc1c63c58c441a SHA-1: 0eb4ef8f359f10266d843057efcf7383e3141bdf SHA-256: 22f5e838b4be103a5ff2df9fb3a6b882c00384dd10dcc0949ef2c35449c79eaf
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/123?utm_term=chemistry+lab+report+example PDF link annotation
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/gigiser-gumifalejapigaf-mufeduj.pdfIn PDF document text
    • https://rowurasivove.weebly.com/uploads/1/3/4/3/134357219/fipovorevepexog.pdfIn PDF document text
    • https://subutadenurafo.weebly.com/uploads/1/3/4/5/134581349/3c45c84586457c9.pdfIn PDF document text
    • https://gugabezari.weebly.com/uploads/1/3/4/5/134577353/roduxunezepakubaxofi.pdfIn PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/2590714.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/9042127.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/badodemebo/farming_simulator_19_weeds_in_grass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ad4824-6c57-459b-be0f-69761240b664/11434272841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4695036c-7c64-402e-a844-7edbec3f0ee5/30258151888.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/free_slots_games_no_no_registration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c0e33a-5641-4559-be33-5434b3a90b22/air_traffic_controller_salary_us.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c7fc23c-c00b-4cba-8a49-067f0ba196d2/12751492359.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153EC 5072 bytes
SHA-256: af6f11da390be1cc4d2162905b97a3c6d052fc84ce4ead4fa011989b6485a511
font_01_sfnt_off0001652c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1652C 12020 bytes
SHA-256: 20e53687a70b791dfa45ccad9f023382a12c6fbf6c0b582a8ed5e3dde7325ba4
font_02_sfnt_off00018e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E2A 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off0001a358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A358 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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