Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f655fd8d88470ba…

MALICIOUS

PDF

88.4 KB Created: 2020-11-23 01:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 77253cc76d6af5ddfd9805a0b019a23f SHA-1: 91b5a0638032bdb9133075ad6236985a1d2a3ff2 SHA-256: 0f655fd8d88470bad009e967c8280d5d0d3200de635ab230e11be83d25cdf288
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://traffnew.ru/123?utm_term=coin+master+mod+apk+march+2020 PDF link annotation
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/kusugaxaju_pipoxeramadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486963/normal_5fa9a3b115dc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5fbaed4e857a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5f8eeb3c91863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388062/normal_5f8fadfca3c2a.pdfIn PDF document text
    • https://nesutidixet.weebly.com/uploads/1/3/4/7/134724555/nuwukigo.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/supubogifar-jesujojex-rojomujaxumij-depibuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_5fb6ddb46b44a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414487/normal_5fb92bdae47e3.pdfIn PDF document text
    • https://biwezufum.weebly.com/uploads/1/3/4/8/134872286/disut-dajopaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489255/normal_5fb3caf692f9d.pdfIn PDF document text
    • https://tidufafedufokaj.weebly.com/uploads/1/3/4/6/134693038/nariwepotabugurufa.pdfIn PDF document text
    • https://kowojifab.weebly.com/uploads/1/3/4/6/134622532/xubopeb_jejub_wazogisi_gekaket.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://uploads.strikinglycdn.com/files/62dde74f-9716-419f-b3a1-5d9d27f4fd87/69881690913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a46fd4-dc9d-47d2-8894-e7b566b99fdf/2321104450.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/26900924011.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 1660 bytes
SHA-256: 1a0be974906210d4428c741e1f6e48a8f0bd6e4353cf9bb243ada8bba2887625
font_01_sfnt_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 5428 bytes
SHA-256: 2aa8684d86d6dba11b18428850f65681b742917feba174ad8e46529a3f2dceb9
font_02_sfnt_off0000fcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_03_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 11180 bytes
SHA-256: 305b2bc8f7a93b5528e126f1a951941af4135f7e29e676d472adf1ae722c9570
font_04_sfnt_off00012c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C06 16820 bytes
SHA-256: 2e7bdcd75ddfffa5a372072bf300c19fb1f8b8f4223872964120bdb37282170d
font_05_sfnt_off000143b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3