Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6412a74dab3f9ae…

MALICIOUS

PDF

80.5 KB Created: 2021-03-08 09:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a95d56611cd5b18984bd84cadca5e0bd SHA-1: 90573c47947080d6451531ade2bda1454f7b3324 SHA-256: a6412a74dab3f9aeb2b44ecb10d3f2edeb761c6e9f50911ac0dc46119ea784a0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://maypoin.ru/123?utm_term=sahih+bukhari+hadees+in+hindi+pdf+download PDF link annotation
    • https://cdn.sqhk.co/xadeviro/geifVgh/4880427942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412582/normal_5fe70912e58a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_6016cb309804a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379859/normal_5ff462fd5df71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390659/normal_60069ea937ff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379602/normal_5fdbb5450ee56.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/YghJgfK/74358470612.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417645/normal_60039544cec2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_5fd805efc92e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/kutty_movies_2019_isaimini.pdfIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_829c6b48d90242048e8152b0e7ba58be.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_3f7bd633fed74939a84e1d198bdaea18.pdf?index=trueIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_f45bac5c22ae4b819545ce8c8dc63540.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/slamming_brutal_death_metal_s.pdfIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_43e50f82feeb4dab8b31e29e0651abb6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/sizevemezobojatidokapod.pdfIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_f08f44c483f741ad93340e30e4317479.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitozi/wivepetutasevetod.pdfIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_f5c9cbef7d9c4f4ab3489336c5f8b6ad.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_c0c6f00dc7014f73b0016f5230228152.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/defotowimaxek.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
    • 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_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 5528 bytes
SHA-256: 5bbdd424157db9bb5508662b0f9334fb3390d478c5c410656443f2247415afb6
font_01_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 10548 bytes
SHA-256: b19678674fa0ebd3dfa9904caccba8dc0caa1f8cfd25f3108ca9b1be6934149e
font_02_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 17084 bytes
SHA-256: 25401989bb15f24f21376abd5817af21e771cd7dfcf794d8a06dafa756dc0a2f

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