Malicious PDF — malware analysis report

Static analysis result for SHA-256 362d48defca531d7…

MALICIOUS

PDF

65.2 KB Created: 2020-11-23 10:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b7db789fd3cd6c1ae8c96d0d0952c2e SHA-1: 7b14408c13214e21e5a54d94b0ed1ac7f1836f07 SHA-256: 362d48defca531d7c7a4c9e10a31eadfb0a3e44d4ccb0b3d795365b3ef1ed4e7
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 PDF link farm. One prominent URL, 'https://traffine.ru/123?utm_term=csi+algebra+polynomials+answer+key', is suspicious and likely leads to a phishing or malware distribution site. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', reinforcing its malicious nature. The presence of embedded URLs and the overall structure suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=csi+algebra+polynomials+answer+key
    • https://cdn-cms.f-static.net/uploads/4423429/normal_5fa81f89dd050.pdf
    • https://cdn-cms.f-static.net/uploads/4389601/normal_5fb61e965cfbc.pdf
    • https://cdn-cms.f-static.net/uploads/4371800/normal_5f948483cc3d0.pdf
    • https://cdn-cms.f-static.net/uploads/4452850/normal_5fb861c09957f.pdf
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5f9f7fd98910c.pdf
    • https://guniroxu.weebly.com/uploads/1/3/4/5/134525914/xumusipuxem_fofawunafowi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sefukirexuwekij/24401353063.pdf
    • https://s3.amazonaws.com/jakujakula/platinum_blonde_short_hair_black_girl.pdf
    • https://s3.amazonaws.com/fizup/24708935093.pdf
    • https://s3.amazonaws.com/sugaguxagu/anemia_perniciosa_diagnstico.pdf
    • https://s3.amazonaws.com/tevomenil/meteorology_today_ahrens.pdf
    • https://uploads.strikinglycdn.com/files/ab1fd9c9-6e3a-4fd6-9eb5-c38e137c0dbe/bopejeg.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b42a.bin
06ae65c8daba218863649fb5952dad697bed2857eee2d06a0d398d8afe4b6663
pdf-font-stream PDF embedded font (sfnt) at offset 0xB42A 5268 bytes
font_01_sfnt_off0000c5fd.bin
c4e914f2eb1eacd4b5fc9da3969faac90aca420518a28b4fbd93c83257db7e5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FD 10460 bytes
font_02_sfnt_off0000e9e8.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E8 4324 bytes