Malicious PDF — malware analysis report

Static analysis result for SHA-256 9391575e559ad157…

MALICIOUS

PDF

82.2 KB Created: 2021-04-01 10:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 82083a8b6429d858615fd15f0358cc5a SHA-1: 05ec278fa47859eb3792fc8c8c5cc6e70c25d59b SHA-256: 9391575e559ad157662aade025db8bf25b1426ba42dfa1fd75291dc4c9df3f39
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://xajibur.ru/wix?keyword=mechwarrior+online+new+player+guide PDF link annotation
    • http://katermore.ru/nuxikukoxusakidztijs.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/qihhijJ/66462136798.pdfIn PDF document text
    • http://about-fb-support.com/pulabobivinareronenakifo7vgrv.pdfIn PDF document text
    • https://cdn.sqhk.co/rekewuneboxu/jgnhgji/xedozonixozeberavugojunel.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/CtJifB7/rollercoaster_mania_mod_apk_1._5._15_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/LgeAzjd/muvufebibiwimadizosimufo.pdfIn PDF document text
    • https://cdn.sqhk.co/gevagedubop/fjh7Rjg/rubomaxilurujoruresepim.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwufeguv/Xgf8AAq/ant_smasher_game_play_online.pdfIn PDF document text
    • http://bilkan.fun/6361338094103o0k.pdfIn PDF document text
    • http://blaugrana.ru/31417067837smdx0.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/hgwhcie/battlelands_royale_pc_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/ididXii/riredidirapesarobo.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/Uihiahd/city_airport_car_parking_belfast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_acbde1de298a472cac5cda43b42d4582.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e3c8839-d459-4763-961d-75035bb1a06b/verb_practice_worksheets_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/pdf_attachments_not_opening_in_outlook_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/9540591966.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/life_science_genetics_multiple_alleles_worksheet_answers.pdfIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_9deb8da475604fb587fbaf16e5ef9dba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/approaches_to_social_psychology.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_df25c85e23c34e7fab9cd7f42c065c11.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satulibaren/55372500723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4aab711-f7b2-4b08-977b-760bd4bc1bb8/how_to_clean_and_oil_my_kenmore_sewing_machine.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_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 5356 bytes
SHA-256: 572aea23b072f736aca4d47d145477aa6369c0c8d5ba75805c8ca56c6d7e9737
font_01_sfnt_off00011393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11393 11268 bytes
SHA-256: 31a003c11a9f414f0ee16ef95e01e48ba30dbd2458cfc730b1a4bd25e310e3c8