Malicious PDF — malware analysis report

Static analysis result for SHA-256 909cff54dc5bed7d…

MALICIOUS

PDF

67.6 KB Created: 2021-05-10 18:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7362fce6364530da460282981ecf10dd SHA-1: db6df33ce603633ee9d5ddb6369f23bf7d908fe4 SHA-256: 909cff54dc5bed7d6a9687daf8bc8ad9e269a92db7b38e4ae47f3e48267563d4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains or file-sharing services, suggesting a link farm or phishing campaign. The primary URL, 'https://maypoin.ru/strik?utm_term=how+do+i+unlock+my+amana+front+load+washer', is presented as a search result, likely to trick users into clicking. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=how+do+i+unlock+my+amana+front+load+washer
    • https://sezitoxonuga.weebly.com/uploads/1/3/4/8/134886233/9174429.pdf
    • https://cdn.sqhk.co/wujugojuse/jcieZhe/new_good_morning_images.pdf
    • https://cdn.sqhk.co/xinoxoxojib/jhgfCQZ/baldur_s_gate_enhanced_edition_modding_guide.pdf
    • https://cdn.sqhk.co/wixexozesila/iieX548/jileriguju.pdf
    • https://cdn.sqhk.co/masunidupag/XigggjD/the_sims_3_cheats_skills.pdf
    • https://cdn.sqhk.co/vuritukupus/thbjh1m/26291247040.pdf
    • https://mesajenijapab.weebly.com/uploads/1/3/0/9/130969967/085de803871.pdf
    • http://rojibitakuvekuw.scienceontheweb.net/26666358193.pdf
    • http://bamirajewenexo.medianewsonline.com/losuratasurixuwabuwujizon.pdf
    • https://cdn-cms.f-static.net/uploads/4457298/normal_606b2871f1331.pdf
    • https://cdn.sqhk.co/fubemabofof/cigkpgh/75728519120.pdf
    • https://cdn.sqhk.co/menaleratupo/8Ojcigp/garou_mark_of_the_wolves_ps4_test.pdf
    • https://cdn-cms.f-static.net/uploads/4464315/normal_6049489761406.pdf
    • https://cdn-cms.f-static.net/uploads/4455403/normal_605ef68f8b2c8.pdf
    • https://cdn-cms.f-static.net/uploads/4417123/normal_604507c08519d.pdf
    • https://tikuvafijosil.weebly.com/uploads/1/3/4/6/134685963/2260557.pdf
    • http://vobajujabu.mywebcommunity.org/playing_to_win_a._g._lafley.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pizexopenaxu/makuvusimi.pdf
    • https://s3.amazonaws.com/wusone/alberta_learners_permit_test_answers.pdf
    • https://s3.amazonaws.com/bewibiwat/aluminum_sheet_standard_dimensions.pdf
    • https://s3.amazonaws.com/xalexojaxipud/love_you_animated_gif.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_off0000cb57.bin
ba32b7bcee6208606f68d289ef6a7bda50e4e63bdf10c679a039e612a2c71235		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 5480 bytes
font_01_sfnt_off0000dde7.bin
f4ecfb5003119a479592ffd876434365b83ab7ce41b841d1dbb063682bcf9004		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE7 10312 bytes

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