Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f578ce771bfc08d…

MALICIOUS

PDF

75.6 KB Created: 2020-12-01 09:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bc2b3bcfeb855d12635f433d976e441 SHA-1: 7840520683847683b34e9a22083db81ff2938a46 SHA-256: 7f578ce771bfc08de98a4f2f7a2a9ea6b0dae9693241b4810e6b82c822fbb019
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://traffking.ru/aws?utm_term=sodium+stibogluconate+dosage+form', is directly embedded and likely leads to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/aws?utm_term=sodium+stibogluconate+dosage+form
    • https://cdn-cms.f-static.net/uploads/4464852/normal_5fbb4382d75f9.pdf
    • https://figotuzu.weebly.com/uploads/1/3/4/5/134579221/rufefitofeb.pdf
    • https://xarisoxetawekox.weebly.com/uploads/1/3/4/3/134399368/e6a987aafa8bc11.pdf
    • https://jevikefogonilij.weebly.com/uploads/1/3/4/7/134747067/4124585.pdf
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5f8dc30ba56dc.pdf
    • https://xomisugasaze.weebly.com/uploads/1/3/4/6/134680352/9985108.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kiwopusafize/bottled_water_business_plan_in_nigeria.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0c00bc819f1cf49fdd82/1606290433709/24432352182.pdf
    • https://static1.squarespace.com/static/5fc169478139af037648d9ed/t/5fc52ade1972c46e3c441fb2/1606757089097/24353152333.pdf
    • https://s3.amazonaws.com/sugaguxagu/fakolup.pdf
    • https://s3.amazonaws.com/subud/65773986913.pdf
    • https://uploads.strikinglycdn.com/files/23b311ba-d81a-42f9-bacf-4ae0942b2f68/beginner_bible_study_plan.pdf
    • https://s3.amazonaws.com/jamokaroxoj/69517132840.pdf
    • https://s3.amazonaws.com/napisakaluja/synonyms_for_normality.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_off0000e44a.bin
20e3ef8cd2351fd43c9b45a8989c7453e26a99d29b17449cbfdcfa4a40550482
pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 5584 bytes
font_01_sfnt_off0000f734.bin
a3df263ffd6f74eac87a2bd09dfb2e786ce60253347f0c3fa8a90f5a5ae45115
pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 12540 bytes