Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a8b73a31cc31e1…

MALICIOUS

PDF

81.3 KB Created: 2021-03-23 08:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0b1473b443358f60d2ca835134e6990c SHA-1: 730852fc0ce04de1fb6a14b4ca9669b1686f1cd7 SHA-256: 63a8b73a31cc31e136ebce624010e22d2cf65cdc207b3890dedf05e27b9205b6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicative of a link farm for SEO manipulation. One of the primary URLs, https://lozipotod.ru/strik, is likely malicious and serves as the initial lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/strik?utm_term=cask+of+amontillado+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367947/normal_600c061b8e970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474220/normal_5fd6252a46a8f.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/hhlgj1t/hide_online_hunters_vs_props.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_5fd3a2953d51f.pdfIn PDF document text
    • https://cdn.sqhk.co/xobupiba/FoHhbhd/airtel_money_app_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406454/normal_5ffd9ac5c6444.pdfIn PDF document text
    • https://cdn.sqhk.co/vegubefeno/FycUjg1/xijaxutudatujavari.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gixawetopoli/53093152610.pdfIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_3c51f9e5158e4e7cb044cbc8778f6f81.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/8735350245.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/my_cloud_app_for_mac.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_c374bc3303344688842128deed71fe48.pdf?index=trueIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_3f730ef64df4465a932d6856073eef6e.pdf?index=trueIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_4399ba8a66674be38dbda18b2597a925.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukut/fifty_shades_of_freed_full_movie_dual_audio_download_filmyzilla.pdfIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_b3cefad75ed74a5081bff91607b62c2d.pdf?index=trueIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_e06784d9c91b44f7956f9e6c7d065b63.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/kinetic_typography_template_free_after_effects.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/adaptation_in_plants_and_animals.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_3731bc6600a54b15994ede10ae542c4f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 5240 bytes
SHA-256: b80b64c4f04cf615b9d2917822ebc7b450d56454a420d1dbb83b9d0ec2a77c6f
font_01_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 11424 bytes
SHA-256: 28ff52d6bd5a960a22614db32ec111c016ad9e65612780a18a05dc11c09050fb
font_02_sfnt_off00012972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12972 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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