Malicious PDF — malware analysis report

Static analysis result for SHA-256 d929c7455d44f19d…

MALICIOUS

PDF

80.3 KB Created: 2021-05-22 11:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 09895c044fddae7024c4fbee98a53d20 SHA-1: 90cf90eabd11df79cdfaa85a458d1a2e1a40efa2 SHA-256: d929c7455d44f19d5a266ce68841b6eb9bc776192da5054aed5fca3db69a6729
226 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external links, with one prominent URL pointing to 'fokemale.ru'. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of encrypting malicious payloads, which are then decrypted via a password provided in the document, to bypass initial security scans. The presence of embedded URLs and the link farm structure indicate an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://fokemale.ru/strik?utm_term=como+dar+clase+a+los+que+no+quieren+juan+vaello+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467936/normal_606c781fc8275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_605601886993b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390681/normal_606e5f993d0b9.pdfIn PDF document text
    • https://wivepeweg.weebly.com/uploads/1/3/1/4/131455463/516d6ce27bb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443815/normal_601a53693f961.pdfIn PDF document text
    • https://mosugomepa.weebly.com/uploads/1/3/4/0/134096926/7781688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_5fe7e8e4a6ae3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379474/normal_5ff29c6f2cba7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476941/normal_601145e7693fc.pdfIn PDF document text
    • https://gidedumewulo.weebly.com/uploads/1/3/5/9/135961218/jolefidibupisul.pdfIn PDF document text
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/869992.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In 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/a59ce73a-a707-490e-8204-0f58f16f2079/duzerunop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e17c3c7-4897-4894-bb2a-5b18913dcb20/vegawopefejijesuludob.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/format_date_field_in_rdlc_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7216d48-796f-48e3-864f-54795af45b3b/how_much_is_hp_officejet_pro_8600_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c819109-4bed-45f2-bc75-b0863805d81d/kudureb.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/53157482978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/324ba132-4c18-47ed-b772-ccf97eba9ba2/examples_of_using_critical_thinking_in_life.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_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 6168 bytes
SHA-256: 0e87cd05f332aeb2a72b3daf131c0310eff8a4a40b86507956a7cca2f5d1d305
font_01_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 5468 bytes
SHA-256: 75632b28c03e67008205a6b4bf31afa42f0c136d00215851f7579d133ac72f5b
font_02_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 10628 bytes
SHA-256: 35c5aaa8d3bd678e46a6cd3a810b8dd37fbebc1b97453759c97f2d4287b4e008