Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded82836f57b9abe…

MALICIOUS

PDF

73.6 KB Created: 2020-11-13 05:19:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 15f6b68f1001deb510fc75c34618e74b SHA-1: 32d18855fdf84592df4c7b63332f1647eb9559f6 SHA-256: ded82836f57b9abe43e1ffe80a26f812f93fad69be9cb3b6026091d27ea4fded
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm, with one prominent URL being traffset.ru. ClamAV and ML classifiers indicate maliciousness, specifically flagging it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a technical query, suggesting an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffset.ru/123?utm_term=what+is+h+in+physical+chemistry PDF link annotation
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/jenavilinab-dofivefimuv-tovefidibanefi.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/xemawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_5fad3043423f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_5f96d1e6bd778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_5fa34baa6c76f.pdfIn 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/25158040-90e7-479c-8126-bb5922d5dada/69719280121.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/segur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a385c2f-237b-4027-963d-cab2c0e1b193/acnl_face_guide_shampoodle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd99983-5e5d-48b9-b0bb-f1c5fa042220/what_is_a_client_service_associate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7645e8fc-7b1f-4e90-bd2e-06a40129ec67/bufisejorijurukidedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa1ea4e-ed98-4692-9593-481e18392f83/wuwikojunuzakuwesuxirora.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/pics_annex_15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6018599b-65c6-4585-bc50-7f056baa65ec/pusudatuxemosuruniw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3C 5288 bytes
SHA-256: 528bfebdcfa64ca272a2a4ee09a6ba221fd538b20d847385a5949e8bc3e9099e
font_01_sfnt_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 10864 bytes
SHA-256: 0bc5a427d860c252edc47d29f392aa5ee7b4373a0376abe318b20e66cd489946
font_02_sfnt_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 16112 bytes
SHA-256: 23e5e0a6ad5360bf10628433507e5aab34c42d7d900ccb2a5214949f2168b422

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