Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b846dcc7613921f…

MALICIOUS

PDF

72.8 KB Created: 2020-11-26 23:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bd8c8c9b314b5597fc1cdae161c654da SHA-1: 48bf4ef29c24db1d7047d714b8ab7872457d1aa8 SHA-256: 3b846dcc7613921f343d458b1d39b20def56e944104913725ae4e3ae604b2d3e
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'mass external PDF link farm'. The presence of 'SE_INVOICE_LURE' suggests a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafffe.ru/aws?utm_term=sql+format+date+column PDF link annotation
    • https://kotepavugenufe.weebly.com/uploads/1/3/4/5/134592782/5d1c50c2a6a9d.pdfIn PDF document text
    • https://kenibuxe.weebly.com/uploads/1/3/4/6/134688639/8826293.pdfIn PDF document text
    • https://ruragivelexodi.weebly.com/uploads/1/3/4/6/134663557/nelajasoson-judik.pdfIn PDF document text
    • https://joponavo.weebly.com/uploads/1/3/4/2/134234964/gesop.pdfIn 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://s3.amazonaws.com/nokiva/beauty_plus_camera_easy_photo_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/b._ed_application_form_2018_rajasthan.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/lukuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a4f92f9-2ac7-49ba-87b3-2dc5d17b4db4/jenur.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/mogowawofatogat.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/24724648367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37667a12-1a04-4f77-bcde-4785c593e146/mr_money_mustache_divorce_forum.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/82482133032.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/stardew_rare_seed_greenhouse.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 5052 bytes
SHA-256: d5bcfc7c420db8a54525d277d907f1f2ffdaa919a684fa830827babd66a2ca5f
font_01_sfnt_off0000e1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 11212 bytes
SHA-256: faf49abe3cddc8020c06db0fa268bd7a236cb200d373faac75e72735b67f644e
font_02_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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