Malicious PDF — malware analysis report

Static analysis result for SHA-256 344619fb33ec2bf0…

MALICIOUS

PDF

63.4 KB Created: 2021-01-06 03:14:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 02fe46bb3361c3a4b5dd39ebe511862b SHA-1: 71c472e4f3fda431b51429f4ac2454e365826ed9 SHA-256: 344619fb33ec2bf0079f53fa63c0f1c2643fab5d44c74b0fc3e333153055745c
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of embedded links, many pointing to disposable hosting, designed to redirect users to malicious sites, including a known malicious redirector. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://traffmen.ru/wb?keyword=temple%20run%20game%202 In PDF document text
    • https://pidakulosa.weebly.com/uploads/1/3/4/3/134391257/02891bc0f6f88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_5f98f86a3eef4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470028/normal_5feb7897ba0fa.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/1732959.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484805/normal_5fdee3f1a1bc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413851/normal_5feff7890cbd7.pdfIn PDF document text
    • https://guwokizesagemi.weebly.com/uploads/1/3/4/8/134855090/tilagagumato_retab_ledozi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481516/normal_5fe5aaacc7c8f.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/de19df0d7e.pdfIn PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/702920.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/23705b42-a5e6-4a41-9f0b-82dad57d3d5b/14274191804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/636d4492-6e04-4f67-b645-88a4f3a67869/esl_directions_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f97f4f94-3ae1-49e5-b29f-6420067e1b7a/2d_array_java_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e0e56f-94cb-4b1d-90c2-319f5bc1923f/48975355130.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD60 5040 bytes
SHA-256: f2caeb837c6c05be0ac121abde54087807e7ac59f152ffc97b6247c7b0c20624
font_01_sfnt_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 10208 bytes
SHA-256: 22fbe72fd713deb7029e85ac24ad024fca6efec79c3673764d6828b54b220fd0

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