Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6cfc264066c97d…

MALICIOUS

PDF

78.9 KB Created: 2021-03-18 16:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7fd7310b246156d1a7d2a8f14c774da SHA-1: 9f4a0b8f1bbcc4666c1d8f3ee3f0411dfd022245 SHA-256: fb6cfc264066c97d38f4293066e7a05800a28b211e42c484e2f408f9afd5a329
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document, likely used for phishing or distributing further malware.

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://resalured.ru/strik?utm_term=marvel+what+if+series+episode+1
    • http://graatorama.fun/how_many_shows_can_comcast_dvr_record_at_once0y437.pdf
    • http://idealslim-ordina.site/how_to_access_tv_menu_without_remotekpmwr.pdf
    • http://mosquito.codes/zenokadedevajuti8mk4.pdf
    • http://rutenowataba.iblogger.org/38497717245.pdf
    • http://mastericy-chistoty.ru/4th_grade_grammar_review0ji20.pdf
    • http://converstarget.ru/payaliya_bajni_lado_piya_song_audioqcmbo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tomaxade/64896499244.pdf
    • https://s3.amazonaws.com/toniseligiwuzux/70781549404.pdf
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_57e025465a524a87bed253d7aecf25ed.pdf?index=true
    • https://s3.amazonaws.com/fuwuzerijofa/1557598346.pdf
    • https://s3.amazonaws.com/luropiw/lasobepisotemaku.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/13th_finance_commission_report.pdf
    • https://uploads.strikinglycdn.com/files/1f7bb80e-2e3c-4335-9469-75a205bc569f/i_want_to_do_hoodrat_stuff_with_my_friends_kid.pdf
    • https://uploads.strikinglycdn.com/files/97113015-1280-436b-83cc-6f263d561f86/votaxawelojumupezewives.pdf
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_4e2f00fbc0494932bc01c2233f91bd5c.pdf?index=true
    • http://lagefow.epizy.com/kovesabipeso.pdf
    • https://uploads.strikinglycdn.com/files/c5e8dd9c-683a-4ee8-9e63-71f8898fc1d0/89888716429.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_off0000f722.bin
b40d8f9d36626f6fca3f8b004f5130bcf18e7ed9ad9f83727ef7a241bc9eafd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 5336 bytes
font_01_sfnt_off00010969.bin
3a7b02860d6f38badab8cb0e7fde9df451876424dfe7e45f5604376a387c26ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 10924 bytes

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