Malicious PDF — malware analysis report

Static analysis result for SHA-256 878a1525089a29f0…

MALICIOUS

PDF

79.5 KB Created: 2021-03-24 19:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c601da138455ad8686a0727b15a22813 SHA-1: b40ef126cb9d1f4059504eaeb04782b7ef178919 SHA-256: 878a1525089a29f072535ec31d5996898882c61b9345039dace977d7bf7e804b
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a significant number of links, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or spam distribution tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/wix?keyword=wild+goose+qigong+berkeley PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416671/normal_5fefe06c02615.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501229/normal_5ff027714210b.pdfIn PDF document text
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/d5c4427.pdfIn PDF document text
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/71412a8fd5ea2.pdfIn PDF document text
    • https://bebotarusi.weebly.com/uploads/1/3/1/4/131454771/6351c6f0fa70f0c.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/siwixomudit/vebunojanopukekijigik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1282cf3d-c273-4537-bd4f-8b693cbd4f26/par_quoi_remplacer_le_cognac_dans_une_farce.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/43706294013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/262e4119-2d29-4532-93a3-8b228d2c5f16/veriradifatadokewekinev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5b2df3-d325-4aaa-93e4-733bbe3592b9/who_is_claudia_in_interview_with_a_vampire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/610f31cc-b7d9-4151-956a-419c357fc32b/vodubewalujatobepota.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_9ae22e64288f43a8bdb22405b003bb1b.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_6c6965085e124b01ac87c7b899de3834.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b254b50-5dcc-483e-ba8f-c856468e496d/kufujevonedud.pdfIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_cf1ba6456dd244db9c4af2d1524e7ff1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45b0ef9b-edbc-42ed-a3fc-7c561480bd11/loxezebozuzawonod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9cb306-3243-4b0b-962c-10b62b07efd2/how_do_you_overcome_fear_of_death.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/leave_request_email_template.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 4936 bytes
SHA-256: 65eb3306c1c2db0ed9953d894fa26c61c21e79bec0eb521ebf5eb1c3b6d96fd8
font_01_sfnt_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 10860 bytes
SHA-256: 414c646d44d0dff88364151c7de91ede822e41f7c075f629986e77eceaaec1f5
font_02_sfnt_off00012333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3