Malicious PDF — malware analysis report

Static analysis result for SHA-256 b171be90bea01a8f…

MALICIOUS

PDF

68.4 KB Created: 2020-12-19 02:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ee9a0d0c77a73b41f7e3aac5b6103c7 SHA-1: 78b3d88cab5ae6680ca9a1ec27fb509e4225a76c SHA-256: b171be90bea01a8fc190cd49f1e705968eaa6a93c5e5786e0487daa6f45c2c5e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL identified as a potential phishing or malware distribution point. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature. No scripts were extracted, but the presence of embedded URLs points towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/strik?utm_term=renton+school+district+calendar+2017-18
    • https://gosasomaf.weebly.com/uploads/1/3/4/3/134370397/31cb6ced94.pdf
    • https://feverawujebuv.weebly.com/uploads/1/3/5/3/135314909/4813941.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8589f065-c63a-456a-b84e-f54435977d7a/iheartradio_all_access_apk_cracked.pdf
    • https://static1.squarespace.com/static/5fc2f572e9fc3622d52f966f/t/5fc4b56b3485235c865b0841/1606727024477/get_lucky_bass_sheet_music.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdefc73570fb44d1c81ebc/1606283207849/reviewing_biology_the_living_environment_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/9b40e16a-ed38-47d9-92f5-36813cee2a23/rapituvijisesejutop.pdf
    • https://uploads.strikinglycdn.com/files/73f2244c-a264-4301-86fa-38dd516d1916/new_york_city_chainsmokers_song_mp3.pdf
    • https://uploads.strikinglycdn.com/files/fe479a7e-8f49-48b6-9307-bbc61408ae62/poetry_is_not_a_luxury.pdf
    • https://s3.amazonaws.com/wufujudisu/byfield_school_ofsted_report.pdf
    • https://uploads.strikinglycdn.com/files/78a7a274-dba3-4e97-963c-8a8bb49e5db4/guns_n_roses_presale_code_2020.pdf
    • https://uploads.strikinglycdn.com/files/a0b05088-a7a4-48ce-b912-70b301cd3d26/18568536256.pdf
    • https://uploads.strikinglycdn.com/files/7ac2bb0f-a73e-48ca-88c9-961b9e6b017d/83067141268.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e4.bin
af084f7dad0af6f1e88826ec9703276aa12861cbb1a90237d4eb06188f878d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E4 5664 bytes
font_01_sfnt_off0000d633.bin
69a0043ad1448d9638e42b62cfd8d433ab4a861fdbe8fff1fadb72c2c9980b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 14800 bytes

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