Malicious PDF — malware analysis report

Static analysis result for SHA-256 051a80bda0ad11f6…

MALICIOUS

PDF

92.0 KB Created: 2021-03-22 05:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51f1633cc9dce21bd39d3e05dc2cf966 SHA-1: 7be126e10d9263fcde9769ab63d9e761d3bc617e SHA-256: 051a80bda0ad11f66aff46b290d52ef5d569ebfd4450085338f4d314d26b3a91
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards malicious redirection, likely to phishing sites or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://seumenha.ru/strik?utm_term=is+wd+my+passport+ssd+good
    • https://static.s123-cdn-static.com/uploads/4382973/normal_5fe2ca7d93623.pdf
    • https://static.s123-cdn-static.com/uploads/4475580/normal_60017f656b9b4.pdf
    • http://riwalimuj.scienceontheweb.net/b_arch_thesis_projects.pdf
    • https://static.s123-cdn-static.com/uploads/4476015/normal_5fe55f444b630.pdf
    • https://bijoxopibomer.weebly.com/uploads/1/3/4/3/134325560/jojanixavudifibofi.pdf
    • http://boribonabone.mypressonline.com/simijesobopalesefed.pdf
    • http://kejoxemubogese.mywebcommunity.org/majev.pdf
    • https://gasuzenop.weebly.com/uploads/1/3/4/2/134266144/kurunij.pdf
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/soxoxowigatod.pdf
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/d218798fca33b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jesidofefe/gezomafigogepivuxaxub.pdf
    • https://s3.amazonaws.com/ropidadegaxut/free_zalo_cho_pc.pdf
    • https://s3.amazonaws.com/bexolamabad/67713987388.pdf
    • https://uploads.strikinglycdn.com/files/3d7ae7d7-7667-433d-b678-846151238068/99193650455.pdf
    • http://nerezusilanake.atwebpages.com/workpro_quantum_9000_series_ergonomic_mesh_high-back_chair.pdf
    • https://s3.amazonaws.com/tometubufimopim/fomosovavogumatajumutib.pdf
    • https://uploads.strikinglycdn.com/files/cd2de435-2110-4f95-a590-719b31edcfcb/patuverosokatireroduzo.pdf
    • https://uploads.strikinglycdn.com/files/7d03131f-be6e-4f6a-ab3a-111a0d7d3dbd/dsc_home_alarm_systems.pdf
    • https://uploads.strikinglycdn.com/files/a98873e7-1f6a-4de6-b80b-145fb0e9f421/uniden_dect_6.0_silent_mode.pdf
    • https://s3.amazonaws.com/wexukufedepim/86479004616.pdf
    • https://s3.amazonaws.com/sewamos/kipibazezumirafusu.pdf
    • https://s3.amazonaws.com/xakapudakadu/gta_3_cheat_codes_file.pdf
    • http://tisavan.onlinewebshop.net/29432949536.pdf
    • https://s3.amazonaws.com/rokuwapesu/video_from_facebook_without_app.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f253.bin
f191556667241c056cef008a7e25a530cd63222480b52d5a28ee24bdb007e576		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF253 10596 bytes
font_01_sfnt_off0001157b.bin
b721d63a35982b2459db91ddcad6b9d4a2cc599d7a526e2adf34fa6feaa2bad9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1157B 5376 bytes
font_02_sfnt_off000127c6.bin
96cd8bca763a712544a32a2bc0044ca7b16a03de8cf6327685458e847c544c51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127C6 10640 bytes
font_03_sfnt_off00014c7e.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7E 16204 bytes

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