Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8359099d7df81f…

MALICIOUS

PDF

70.0 KB Created: 2021-03-14 19:09:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e077e2d6da13eac87254d4419879217d SHA-1: 74ab90ca8367039deec51ef497d8c7620f6c8b36 SHA-256: ca8359099d7df81f6461ab67c155d6d4ce159489849445b42dd285a7859a9d30
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. The embedded URLs and the structure of the PDF point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware distribution.

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/strik?utm_term=sony+ht-rt40+settings PDF link annotation
    • https://cdn.sqhk.co/birenejar/deyPiiq/51450712634.pdfIn PDF document text
    • https://cdn.sqhk.co/korokotuduki/72DhbaA/toys_for_guinea_pigs_to_chew_on.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469850/normal_5ff1f409cbc9b.pdfIn PDF document text
    • https://gomibabojusul.weebly.com/uploads/1/3/1/4/131483197/9d5c7ba.pdfIn PDF document text
    • https://cdn.sqhk.co/digatamale/fNJihzm/71263595140.pdfIn PDF document text
    • https://cdn.sqhk.co/letowajaf/jdjflgc/dragon_ball_legends_hack_2020.pdfIn PDF document text
    • https://nonuradijo.weebly.com/uploads/1/3/1/4/131406562/3297136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379856/normal_5fc8d22c4b293.pdfIn PDF document text
    • https://mukeremu.weebly.com/uploads/1/3/4/3/134316251/e95dd88fc4d86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407729/normal_5fc996da71bdc.pdfIn PDF document text
    • https://josudirojupa.weebly.com/uploads/1/3/4/7/134729494/5158252.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/7f6cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8147148c-ca8d-4b6e-9c25-4742a31225be/wijuxevafimoge.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_c88171be51304eed956f60b3846ab55a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be245c3d-f9ee-4010-93c4-de1fcf8b0158/service_engine_soon_light_wont_go_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0bb2723-d1ed-4c8f-9ee1-16ec5ffd4083/how_to_claim_barclays_phone_insurance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97080ba4-dc94-42d5-852b-3a68ec9161f4/what_is_the_main_difference_between_paraphrasing_and_summarizing.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_281076d05d7742849d6bac8372c12c9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ab87e7b-e461-4fec-a271-e4b5e8dd14b7/birerozelefukalofuro.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 5172 bytes
SHA-256: 8af64e33976f1212618c2fb6a49832d5a1877f951a437e94f6aa10da7440512a
font_01_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 9984 bytes
SHA-256: 9e4669f13eea4059062e6fe43311cdcc9ab57c8516d68083a238ab08a156ec9d