Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6f5132fa4892c8…

MALICIOUS

PDF

78.1 KB Created: 2021-03-11 15:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59a5860b08f7a757828139d2c31a8f25 SHA-1: 7121b85faffa147bc15fbd55d0610066ebb3b004 SHA-256: 8b6f5132fa4892c8d31e6c0d7b7442687c738d4df7fe2599bd19750b1cd25f3a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://xezojetit.ru/strik?utm_term=the+story+of+oj+lyrics', are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/strik?utm_term=the+story+of+oj+lyrics
    • http://lovupijuti.getenjoyment.net/12884806789.pdf
    • https://cdn.sqhk.co/lexuxeza/gjn0hjx/3ds_max_overkill.pdf
    • https://cdn.sqhk.co/koroxofusino/2xhWJoo/radiant_heat_boiler_repair.pdf
    • https://cdn.sqhk.co/fonixoligem/aPgghhg/chess_board_game_pieces.pdf
    • https://cdn.sqhk.co/weralutofa/ghgiWOb/9049574138.pdf
    • https://cdn.sqhk.co/wejewenu/hejcM6x/lawezakolazapenupolal.pdf
    • http://nesorus.mywebcommunity.org/nebapoziz.pdf
    • http://lipenav.mypressonline.com/89723407575.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6af7e03c-5528-4e80-b035-631e57c3cc63/arris_surfboard_sb6141_xfinity_setup.pdf
    • https://s3.amazonaws.com/pibajuwi/53221828829.pdf
    • https://s3.amazonaws.com/vuxagixil/tekonsha_prodigy_p2_wiring_diagram.pdf
    • https://s3.amazonaws.com/jepinebawo/marriage_contract_psa_form.pdf
    • https://uploads.strikinglycdn.com/files/b6baa211-f761-450b-86d3-52a93a660e17/2010_chevy_camaro_ss_turbo_kit.pdf
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_2117b65c08e64738987724b74252b6f1.pdf?index=true
    • https://s3.amazonaws.com/bezorito/starfinder_player_character_folio.pdf
    • https://s3.amazonaws.com/xanunafojuloki/tebaledejigidoxivutaximop.pdf
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_0784d04cd7084be0b124a508e2893615.pdf?index=true
    • https://s3.amazonaws.com/zowibatev/36213960852.pdf
    • https://s3.amazonaws.com/widuxade/wesigiwonapabajiwiran.pdf
    • https://s3.amazonaws.com/liwara/fiwewiraremitox.pdf
    • https://uploads.strikinglycdn.com/files/dba3c85a-4375-490f-abf8-af5837955718/berenstain_bears_books_amazon.pdf
    • https://uploads.strikinglycdn.com/files/c3c04ec1-d728-41ce-902d-bd6f1fbb7f54/general_purpose_vs_specific_purpose_vs_central_idea.pdf
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_af2afb8a7aec4d0cb0e2bb1247f7ea80.pdf?index=true
    • https://uploads.strikinglycdn.com/files/55d844a2-fa61-45fb-adbd-f67de454bf4c/rotexosul.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_off0000f32c.bin
7f365cc52250e0dbf87712f6efcd450878ff685395f01f32031251fa4b4d9687		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 4888 bytes
font_01_sfnt_off000103d8.bin
c524dc51681f441f7d8e15e41a6620dab1d08ced2a2a5600d96c88dfa8906bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 11628 bytes

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