Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f15c685ba06230a…

MALICIOUS

PDF

72.2 KB Created: 2021-03-15 23:19:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c1e852f17f4f3e8ed8b6d8a3dd4db31 SHA-1: da4721de414d066d7db6d2c68079c3539d1282de SHA-256: 9f15c685ba06230ab4f034b468b810784b4ec6afb80b1e81b54d08c27d891be6
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, many of which point to SEO-optimized PDF documents, suggesting a link farm or redirection mechanism. The primary external URL identified is `https://botokaw.ru/wix?keyword=asexual+reproduction+worksheet`, which is likely the ultimate destination for the phishing or malware delivery attempt. No scripts were extracted, but the PDF structure and URL usage are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/wix?keyword=asexual+reproduction+worksheet
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fd689dc64b23.pdf
    • https://static.s123-cdn-static.com/uploads/4446026/normal_5ffd521be561c.pdf
    • https://cdn-cms.f-static.net/uploads/4387919/normal_5fd2867fd3646.pdf
    • https://cdn-cms.f-static.net/uploads/4450506/normal_601a0f685a530.pdf
    • https://static.s123-cdn-static.com/uploads/4481821/normal_5ff8a181a831e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bisute/24948167643.pdf
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_c65a773153fc4b1fb969abb3554841a3.pdf?index=true
    • https://s3.amazonaws.com/lokijuronig/bernoulli_s_theorem.pdf
    • https://s3.amazonaws.com/rogugagatuf/skype_for_business_web_meetings_app.pdf
    • https://s3.amazonaws.com/fejififimaketo/15760221791.pdf
    • https://uploads.strikinglycdn.com/files/f7646f5d-08b8-43df-88d0-f95036bbfc41/38817783383.pdf
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_7175dc77df8e45408df2e190def9db8f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4b373101-33fd-4b0e-8ddb-3e4082576a7f/12060831684.pdf
    • https://s3.amazonaws.com/sowirutelevolur/is_samsung_ultra_worth_it.pdf
    • https://uploads.strikinglycdn.com/files/d7f313af-ccd2-4223-9d8f-3bdb1116c532/wefakatabonijovimezesowab.pdf
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_bdce9ac87d6f4371b873bcb9b1444702.pdf?index=true
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_46590d6f769843cea04c24928b4d1ece.pdf?index=true
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_cd01d7909fb94f73a1944bc71e484bbd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fe9d4ed7-8d4d-4e62-897b-8ac25725992b/what_day_does_report_cards_come_out.pdf
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_a152f6fa6d8740a69b3d39e091a00072.pdf?index=true
    • https://s3.amazonaws.com/sedowedi/muxuzudujanozesurute.pdf
    • https://s3.amazonaws.com/matogapibelifiv/android_game_app_development_services.pdf
    • https://s3.amazonaws.com/divexikav/allah_avalente_pennakane_video.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_off0000dea3.bin
60055b6c214f98c7fbf0d4f301cc3d54bd66e4c364862d9a65c727c9de98f0b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 5372 bytes
font_01_sfnt_off0000f0fa.bin
f12901b5d91c5bbcfb07376cb5516bfc6553f3490595e2699089ff87758c315b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 10136 bytes

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