Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d10f233e1e54e0…

MALICIOUS

PDF

71.7 KB Created: 2021-03-17 19:08:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28278d9fce95da9110210b91e5e75e83 SHA-1: 79b375995fea7ecd927e107971a850511b020b5e SHA-256: f8d10f233e1e54e0e53f6cde4a09be1ca464f622717e96da59bd87ece6737dc6
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a suspicious domain ('vilenefex.ru') that is likely part of a phishing or malware distribution scheme. The presence of a 'download button' lure and a callback lure further supports a phishing attack pattern. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/strik?utm_term=blackmagic+atem+switcher+update
    • https://kowexemi.weebly.com/uploads/1/3/1/8/131872048/0edf02787ab738.pdf
    • http://trenketo.buzz/10499148641y3f3h.pdf
    • http://meinekarten.best/do_not_touch_the_trim_stickerf17gr.pdf
    • http://zoxodur.sportsontheweb.net/remington_700_short_action_receiver_weight.pdf
    • http://ottics.ru/hp_probook_6470b_core_i7_pricenqm13.pdf
    • https://zurejekivob.weebly.com/uploads/1/3/0/8/130813755/980b42754.pdf
    • http://movawizaxaxato.mywebcommunity.org/68395644682.pdf
    • https://vabiganivasekeb.weebly.com/uploads/1/3/4/3/134339064/9618487.pdf
    • http://xufededubumavif.scienceontheweb.net/9166683532.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_61c021a525f0441cb46c80396e96b1b6.pdf?index=true
    • https://s3.amazonaws.com/wusigipufuvowix/befojolewibe.pdf
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_ee06e334cb84404080274b81b10ff9a1.pdf?index=true
    • https://s3.amazonaws.com/potamotaz/chinese_character_to_pinyin_app.pdf
    • https://s3.amazonaws.com/gusule/how_to_change_9v_battery_in_kidde_smoke_detector.pdf
    • https://s3.amazonaws.com/nisiwanolom/revista_boticario_ciclo_2_2019.pdf
    • https://s3.amazonaws.com/jotogorurekuro/colorlib_coming_soon_template.pdf
    • https://s3.amazonaws.com/genedonapubefe/vikumifunoziwikufawuxe.pdf
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_0a3cc8238e3f400a8822cf2a7e1b9745.pdf?index=true
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_b169bdbcc4b14769a23f6970395c0d48.pdf?index=true
    • 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_off0000d778.bin
152254c08c2e31b70f7d81f7a049b0c8a12d65794f38750cdbd786352f4b10fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 5692 bytes
font_01_sfnt_off0000eac7.bin
425b66fa60bb567ab4597458c4dc63abb04f553681cc38f98d1d01048329695b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 11804 bytes

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