Malicious PDF — malware analysis report

Static analysis result for SHA-256 be831a432d31fbf6…

MALICIOUS

PDF

86.4 KB Created: 2021-02-18 07:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0500d938c99b5387e342ad165ea4ad0e SHA-1: 5a5ff843b5e685ca64f51072dbd8e1345e01728e SHA-256: be831a432d31fbf6d6b2e3ebf20760003981a70d2478f68e3559c31d8cd1ba3d
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards a phishing or malicious redirection scheme, likely designed to lead users to exploit kits or further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=sharp+tv+won%2527t+turn+on+flashing+red+light PDF link annotation
    • https://mumizovis.weebly.com/uploads/1/3/4/3/134350635/9769051.pdfIn PDF document text
    • http://goldenframecollision.com/peniverizot3l40.pdfIn PDF document text
    • https://lufumapapolag.weebly.com/uploads/1/3/4/3/134353855/tasog.pdfIn PDF document text
    • http://about-igsupport.com/earnings_per_share_questions_and_answers0047r.pdfIn PDF document text
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/najepu.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/27Fhjig/tomekagorusiluxomibimita.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/jeibVhc/rooter_game_streaming_daily_giveaways_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/egdY34f/kileriwobik.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/agchjhj/95753771571.pdfIn PDF document text
    • https://cdn.sqhk.co/xutijexop/g9gfieS/razer_blackshark_v2_vs_v2x.pdfIn PDF document text
    • https://cdn.sqhk.co/lijuwezasip/DVgfige/forest_pop_bubble_shooter.pdfIn PDF document text
    • http://bonusiotsbera.online/84862707966wz60e.pdfIn PDF document text
    • https://detiloxobaz.weebly.com/uploads/1/3/1/3/131398171/b08cb83e9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojosikol.epizy.com/mujijosibesep.pdfIn PDF document text
    • http://xoxozuzupa.rf.gd/refesobazepukopafuvoruv.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/tamil_e_magazine_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/pimipatoremegu.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/kilixiridowo.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/berklee_performance_center_streaming.pdfIn PDF document text
    • http://sogulonogob.epizy.com/55353040260.pdfIn PDF document text
    • http://guganukipajaxi.rf.gd/dotnet_cli_update_templates.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_off000111bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BB 5592 bytes
SHA-256: 2ef258f3814df1f8d299cbc9fd0eb3489b0189f4960f641aafa3c6508e47e9c1
font_01_sfnt_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 11412 bytes
SHA-256: afdaa25172de2f52a6c6578505b5c2765ef4c9755604582aa4d320ea2d605374

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