Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e5b972380d6d01…

MALICIOUS

PDF

74.8 KB Created: 2021-04-17 10:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: cef39e0d9b34d785dcaec53f64da26e1 SHA-1: ccd4fd3845ea877d246583a0482f89a0eaa2f816 SHA-256: 81e5b972380d6d01eb82825ce309ee6843c0bf53c64c22e66dee59fea1bae674
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://jottigo.ru/strik?utm_term=richard+taruskin+history+of+western+music+pdf', appears to be a lure, masquerading as a search result for a specific book. While no scripts were explicitly extracted, the heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of outbound links, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=richard+taruskin+history+of+western+music+pdf PDF link annotation
    • http://gawolesimavuvad.22web.org/adjective_grammar_worksheets.pdfIn PDF document text
    • http://dovamemowiruz.iblogger.org/treble_clef_note_practice_worksheets.pdfIn PDF document text
    • http://zegevuk.22web.org/54781679087.pdfIn PDF document text
    • http://vovodofozufora.iblogger.org/pinewomosagi.pdfIn PDF document text
    • http://dakixofib.22web.org/14052387352.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mutoris.rf.gd/10363490072.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/self_help_lorrie_moore_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/vande_mataram_tamil_hd_video_song.pdfIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_e0a8cb59d4ab4c5bb4ca27c5642efb4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lawakux/70955476326.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/remote_and_austere_medicine_field_guide.pdfIn PDF document text
    • http://tiwadelir.rf.gd/tufabinufogewozajodi.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_e6ea6206822843e2a7f191aede86bbd9.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_136fccb653f646f8b1732ab3e65d4aa1.pdf?index=trueIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_18a82c8b54504721bcdba014674ebc55.pdf?index=trueIn PDF document text
    • http://vukupemenamumoz.rf.gd/15395669678.pdfIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_b57fb3a9619e4203aeec59ef9d3e3782.pdf?index=trueIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_b7e206721af5486daa49b15d030cd057.pdf?index=trueIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_c9057e1563bf43848546472e9a365c88.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lonozote/where_is_the_navajo_tribe_from.pdfIn PDF document text
    • https://40c507a3-37b7-491f-afd3-f28ba3af1fb2.filesusr.com/ugd/7f5264_7897e0d99ec74267b5d892ebe41f2a8e.pdf?index=trueIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_134f1510c3d948c8bb0f46562c33a329.pdf?index=trueIn 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_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 5628 bytes
SHA-256: 1e6c3ff4c07ad1c5a1cfcb836e0ec9a2e920a8a342d04514ea8bdd33e9c45fe3
font_01_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 11908 bytes
SHA-256: df1e6c864af5977f7f7872ceebf92c0f8ec5b44ba0772717f235af24077a38e5

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