Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5f9c4e3b99dcfb…

MALICIOUS

PDF

75.4 KB Created: 2021-03-15 20:22:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0c7d2625d6e862b46e8c8d4824c1a974 SHA-1: e7032e7d05a94592bc2db9253f9c9d0fc7609e34 SHA-256: 6e5f9c4e3b99dcfb8f1f3d34d1d32947203f2d9f8faeed671190db9f03ff4442
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/wix?keyword=roadies+rising+15th+april+2017+calendar PDF link annotation
    • https://cdn.sqhk.co/jobezivozuf/ShdRbki/megan_is_missing_trailer_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/eDjijep/pandora_s_box_game_for_pc_free.pdfIn PDF document text
    • http://testrun.ru/chamonix_aiguille_du_midi_guidexler2.pdfIn PDF document text
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/guxofapive.pdfIn PDF document text
    • https://cdn.sqhk.co/setuboluraje/9B4hj8y/kemikagivad.pdfIn PDF document text
    • https://cdn.sqhk.co/rokatodupi/MWKjbz4/65988545557.pdfIn PDF document text
    • http://pazolozul.mypressonline.com/78027239083.pdfIn PDF document text
    • http://smartcreditus.info/sumunuepm6o.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexovebo/fjeE7ZF/idle_investor_mod_apk_2._1._14.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/xT3aBje/23848325668.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/ROjfjDh/60302517800.pdfIn PDF document text
    • https://bonitolopulako.weebly.com/uploads/1/3/1/3/131384654/tekiw-duzud-jufasix-muxawewune.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekasip/dez2319/regat.pdfIn PDF document text
    • https://finazevad.weebly.com/uploads/1/3/0/7/130739247/tusenat-loluxatinu-xukisajuvuveru.pdfIn PDF document text
    • https://robatuzuj.weebly.com/uploads/1/3/3/9/133999789/fefisoja.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/iAllihe/pixel_zombie_hunter_game.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/1DjjUJA/age_of_war_2_similar_games.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/moxumel.pdfIn PDF document text
    • https://cdn.sqhk.co/xumobopore/dhcgghz/yelp_for_business_owners_login.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/mKRoGid/invasion_definition_ks2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xufoziminep.onlinewebshop.net/bethena_scott_joplin.pdfIn PDF document text
    • http://jumawivowibeb.onlinewebshop.net/27394247208.pdfIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/best_recipes_from_chrissy_teigen_cravings_2.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_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 5872 bytes
SHA-256: 499f8979ab677cfe3ea881694577ee8db547cd849e975d42a510a0e681a26f57
font_01_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 10380 bytes
SHA-256: 13cfcd2190d04fa4a437d85039da1d0c1867907a5241dbb00684167ad0c66afe

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