Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4a3517988f331b…

MALICIOUS

PDF

69.0 KB Created: 2020-12-17 00:18:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c5e8a671fb3e9378278be9106fe44e4c SHA-1: 5633546031903390432530f14664ebd0fe9cf1eb SHA-256: 4f4a3517988f331bac52145b8f9cea66369f5108954f29c039fef4ce5658a52a
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/aws?utm_term=android+version+6.+0.+1+name PDF link annotation
    • https://wojewifonutej.weebly.com/uploads/1/3/4/8/134883442/ruverizupob-wabiwaxenofeju.pdfIn PDF document text
    • https://peninugeba.weebly.com/uploads/1/3/4/6/134666339/4694719.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/621d4d7cc1a.pdfIn PDF document text
    • https://ditowesoxuro.weebly.com/uploads/1/3/4/8/134885058/76bd2688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_5f9d4e27cc8c9.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/kofimidipi.pdfIn PDF document text
    • https://gipulafu.weebly.com/uploads/1/3/4/4/134442702/6460372.pdfIn PDF document text
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/1b483ba1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc67aea084698658e84b086/t/5fc896097ff5a343ebf908b6/1606981130363/wuzuker.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffb205e8e827d4288adb3/t/5fc2140c3570fb44d14a5d04/1606554638272/bulofemuvufodib.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc18c699698b02c7f25315b/t/5fc70c5b09f4d56e8f7bf2c5/1606880348495/chopped_iceberg_wedge_salad.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e60b24b06a7eb3ff207b/t/5fc916e8d9950f711a0fab90/1607014122625/pinkfong_abc_phonics_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/tivun.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfb17d334513fae41fd2d/1606220567742/zugigowuvotuguvibigo.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/jupifuburusejefitosi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e703bda9c57a97be38fb/t/5fc6c9cdb2fa4660c8bf205a/1606863314081/34428631715.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0232abe9b69395106a58f/t/5fc2edca64571256549d3f33/1606610380098/apk_nox_for_pc.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_off0000d0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AB 5368 bytes
SHA-256: bdef0d640ac70bb9ad1d6e79e377e373da994920534be490b18c14a63a6f4454
font_01_sfnt_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 10724 bytes
SHA-256: 8c3464d583ccea8c299f54742635a0732c8e1c533d566402b4af16016c9f6697

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