Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ead933cd56379ad…

MALICIOUS

PDF

70.3 KB Created: 2021-03-28 23:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb3070a3a6c01e6ea6cfb91c3213a882 SHA-1: 9fceb11dcd291ee2f12c80bc4bad78c01e45625e SHA-256: 9ead933cd56379add82653e04e37e2f1d09cc881b79a8eb5b084a7b2f0273df6
226 Risk Score

Malware Insights

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

The PDF document contains a high number of embedded external links, many pointing to disposable domains and suspicious URLs, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content, potentially for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • 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://baarspo.ru/123?utm_term=lagu+abiem+ngesti+pangeran+dangdut+mp4
    • http://mmeueue.space/salumalab2g66k.pdf
    • http://servisvds.ru/37628099019tbz4.pdf
    • http://fakaripeti.xyz/vomiretegufegolibobekej5ogg.pdf
    • http://visiblawty.com/91293246816gkcsj.pdf
    • https://badakawage.weebly.com/uploads/1/3/0/9/130969543/4022228.pdf
    • https://wotakowa.weebly.com/uploads/1/3/4/8/134885303/5838450.pdf
    • https://tuwuribo.weebly.com/uploads/1/3/6/0/136027226/gegaradelisizaj-perabipukexoza-wadebositigifi-kopazilogu.pdf
    • http://com-login8.xyz/irumudi_kattu_sabarimalaikku_tamiluz61l.pdf
    • https://jinepesel.weebly.com/uploads/1/3/5/3/135346763/45edd600.pdf
    • http://turefobi.22web.org/lean_muscle_building_diet_plan.pdf
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/d202b2c209e63f3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_d78a4fefdef840cbb18fe2841f9730f0.pdf?index=true
    • https://s3.amazonaws.com/tometubufimopim/musufusojexaz.pdf
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_c2ef4de3e1ee4f4c855007154eae293c.pdf?index=true
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_830126ff33874fecaea99701d5038362.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_7e1d9d1ea6284d02a0a54bbba39335ff.pdf?index=true
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_5b28f807095a4f369a6029c3058cb22a.pdf?index=true
    • https://s3.amazonaws.com/kujesulad/kung_fury_movie_2019.pdf
    • http://bobiwaj.rf.gd/caller_name_app_free.pdf
    • https://s3.amazonaws.com/tolivajupeku/72562624001.pdf
    • https://s3.amazonaws.com/nodetuxapabara/fixaxazakexotasosur.pdf
    • http://rujemivegelap.epizy.com/king_bernard_song.pdf
    • https://s3.amazonaws.com/posufij/how_to_look_up_parcel_number.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_off0000d473.bin
17296231b27e2319d6b6c488cc67600d5cc668752269916e3aad2ab52fca0fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD473 5416 bytes
font_01_sfnt_off0000e6c7.bin
15f1af74d43a390caaa9713307e392de90e50ea4aab95b80122b917e7bb0390a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 10280 bytes

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