Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b4d9dd7f5145aa…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 04:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9669827cd1ff7ae2f0b64ea771582095 SHA-1: a4b2643b356981ad854a41d87635e0c9f563fde4 SHA-256: c1b4d9dd7f5145aa6094b2d8c7f65612a00671dad03614e148763bcacd175ae8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. ClamAV and ML classifiers identify it as malicious, likely a phishing or malware distribution lure. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=pool+table+games+apk PDF link annotation
    • http://canxetaidientu.com/images/file/23939239497.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/paxenoxotegawavetamenuji.pdfIn PDF document text
    • http://soupworld.de/upload/file/53965966079.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/33553427971.pdfIn PDF document text
    • http://101balkon.ru/upload/files/92745761425.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210908171900.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/33874946368.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133f87b58105---nikirixavezewovurezizike.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/xuguvadevoto.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/64883788291.pdfIn PDF document text
    • http://ducnhua.com/upload/files/68469476936.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/71825141935.pdfIn PDF document text
    • http://labsshop.com/d/files/sefedonoli.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/vozifefir.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/mugewetudegisusatukexe.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2c4ef044f---24076840503.pdfIn PDF document text
    • http://klhl.com/userfiles/file/nakimufelinirarogar.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/tijokejelivipikada.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/rixoxawu.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/78643962386.pdfIn PDF document text
    • https://timminsrenovations.ca/file/hqqpRmawRcfPss9G.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/81820795951.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/82174657792.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/babusi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 17404 bytes
SHA-256: 37e9e53b8ea80a278dafd5aa30a7786a8bee28de7ba3a9e98d3dfe5b2e3f15a1
font_01_sfnt_off00010b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 10532 bytes
SHA-256: fed47a90b2bf59bc931f2f79faed039edc5645b940faa2e627b847a6aae6f22b

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