Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7577d47ec4d9cc4…

MALICIOUS

PDF

87.6 KB Created: 2021-03-20 21:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 053cadff2f46e5bce864cb34bffc1f15 SHA-1: d2064cd7382b93f2f11a471415bd1e77b3c524a7 SHA-256: a7577d47ec4d9cc4188244b1614e7cb9f5b8d743f9323d9034276e7151a3fd6c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, many of which are dynamically generated, suggesting a link farm designed to distribute malware or phish for credentials. The embedded URLs point to various domains, including one that appears to be a keyword-based lure for 'spotify offline player apk'. No scripts were extracted, but the PDF structure itself is used to host and link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/wix?keyword=spotify+offline+player+apk
    • https://cdn.sqhk.co/mojubemuwek/gfvjdmJ/legendary_pokemon_cards_gx_and_ex.pdf
    • https://cdn.sqhk.co/zegareguw/0khfZhe/tukax.pdf
    • https://cdn.sqhk.co/busosuwik/g5OQjbv/pibabaxaluvawogafide.pdf
    • https://cdn.sqhk.co/retesixabe/usphfQR/twister_movie_cast_where_are_they_now.pdf
    • https://cdn.sqhk.co/kamavedes/hijeq0g/57619795845.pdf
    • https://cdn.sqhk.co/wojipezusax/dgcibgi/31842917181.pdf
    • https://cdn.sqhk.co/susojitigi/0P0Mzie/overcoming_obstacles_relationship_quotes.pdf
    • https://xanosetad.weebly.com/uploads/1/3/1/1/131163691/xovafixivok.pdf
    • https://cdn.sqhk.co/lolajelor/BxUHgig/coc_hack_clash_of_clans_mod_apk.pdf
    • https://cdn.sqhk.co/vuvapolaxaj/miahbjc/77193750244.pdf
    • https://jaxipalat.weebly.com/uploads/1/3/4/7/134746428/gexogitixakuv_suwegarenabiwul_wafow.pdf
    • https://cdn.sqhk.co/bitaxukezor/gfidhgI/15623779200.pdf
    • https://lewuseloti.weebly.com/uploads/1/3/1/4/131437615/a538fc41d6c.pdf
    • https://vesexifog.weebly.com/uploads/1/3/4/4/134491049/40da6bff198090.pdf
    • https://cdn.sqhk.co/bibilofefi/XpjhfOC/45586392861.pdf
    • https://cdn.sqhk.co/xoxapivasif/4YeMjdu/mega_man_mobile_mod_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_512ebf658c4c4e4e9589dee70e5d40ca.pdf?index=true
    • https://s3.amazonaws.com/jiwotarotavuz/39870240136.pdf
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_9c407082878c4d35a5fd3ec9544f8238.pdf?index=true
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_8e354d3053e441b8ac6b6720fd235a71.pdf?index=true
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_3d2a6126d68f4dd595a5d8c364d3b692.pdf?index=true
    • https://s3.amazonaws.com/nisiwanolom/craftsman_staple_gun_68514.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ed.bin
069dfb1fc35b0e55efd12929ff85e07615d4501fbf422b903042cdfe12064eb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 4984 bytes
font_01_sfnt_off00011500.bin
601ae214e3b48f00ebb304aae4314f7324eef987cd960445bfb9eafa06db4da8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 11188 bytes
font_02_sfnt_off00013b30.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B30 16312 bytes

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