Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5066bc4b881ab4…

MALICIOUS

PDF

71.6 KB Created: 2021-06-01 04:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d2bd8210af4d8f08dd524062d367822c SHA-1: 2d4d5f3860725f862ffc3e76dcbbb67e81e302f8 SHA-256: fc5066bc4b881ab40cd713f7f1a72c17de35da755b831b30bdba8538152b3e10
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as a phishing trojan. The embedded URL, 'https://allytemp.ru/pbw?utm_term=general+knowledge+mcq+questions+and+answers+pdf+in+marathi', suggests a lure related to general knowledge questions. Although no scripts were explicitly extracted, the PDF structure and URL suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/pbw?utm_term=general+knowledge+mcq+questions+and+answers+pdf+in+marathi PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402520/normal_5fc9ec47566bc.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4485942/normal_60b0fb62ecb5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494147/normal_5fdfc81425e33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_606046d17292b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464314/normal_6049496ccbe64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_605d79e0df0f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukonisu.pbworks.com/w/file/fetch/144438948/takumojokulivik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18fbec1b-4e00-46f5-80b5-d65f185b9603/arduino_board_types.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/missouri_boater_safety_test_answers.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144423387/how_to_use_aimbot_warzone_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa17580e-4576-4c66-b94f-7b058c4fa9cb/negoloxobunazufolowup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9efa917-c935-460d-aeae-e9fa1fa10e04/is_sodium_perchlorate_acidic_basic_or_neutral.pdfIn PDF document text
    • http://zigunef.pbworks.com/f/38985264932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffdaa042-855b-47f3-8411-bc334bffcfef/govozijajegubafiwogikeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54077796-085e-451e-9300-4408f91dddfa/vuroxix.pdfIn PDF document text
    • http://finebov.pbworks.com/w/file/fetch/144440760/3706448165.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144427695/wozujepiduvumup.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/w/file/fetch/144441255/46628190355.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_off0000d832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 5884 bytes
SHA-256: 87b7519419f884e808779eb9607b13739b2f99abac2788a9e4c1078cf56628fe
font_01_sfnt_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 11124 bytes
SHA-256: 0cd6a8e1a09800af384b515707650f34e05584706f397c604b343bfa2e7e2994

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