Malicious PDF — malware analysis report

Static analysis result for SHA-256 718c4db244f27588…

MALICIOUS

PDF

60.7 KB Created: 2020-11-23 14:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfa502bbfef18a5865a0231e431c13c3 SHA-1: 181999b5ac8bc22d8196a861e2fb32251c75c4e2 SHA-256: 718c4db244f2758893ccaf6413f49538938078939b7fc25695ca750f98c06c93
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosting services and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://trafficel.ru/123?utm_term=brandon+campbell+junior+highlights
    • https://xudibonazo.weebly.com/uploads/1/3/4/3/134353284/wuxivexilubo.pdf
    • https://vedixoba.weebly.com/uploads/1/3/4/8/134864822/dabezeboparofuga.pdf
    • https://suneminus.weebly.com/uploads/1/3/4/5/134529318/jinokuxi.pdf
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f9da06e5e061.pdf
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f989bccb3e64.pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/aa0e40a5ef4215.pdf
    • https://velebipuzufal.weebly.com/uploads/1/3/4/4/134434208/giniloxiw_duxok_vetutewo.pdf
    • https://cdn-cms.f-static.net/uploads/4411218/normal_5f93428e9aa27.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sixenogafopoj/ap_chemistry_summer_packet_answers.pdf
    • https://uploads.strikinglycdn.com/files/7a4ebf57-6ae2-4a50-bcc6-f41296954aa9/xesinenik.pdf
    • https://s3.amazonaws.com/tamobalasu/letudumubin.pdf
    • https://s3.amazonaws.com/fezenur/zekusavaxibukotamujil.pdf
    • https://uploads.strikinglycdn.com/files/b971d9de-89b7-43f9-aa5d-2008a00106c4/62288127359.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b045.bin
6870ed51441f07687af932f8ba22f9fc9bddc2498df4672b168f5eda8c256782
pdf-font-stream PDF embedded font (sfnt) at offset 0xB045 5752 bytes
font_01_sfnt_off0000c3a7.bin
fa92d07a7c25b302eda96002bdc558d073facb31fcf1e29f36ebc9e0956c799c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A7 10028 bytes