Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bff63f68e61abe4…

MALICIOUS

PDF

82.7 KB Created: 2021-03-30 23:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe7f8ce0620db10e9f08c6a58e145138 SHA-1: e7f78eb0871811486c2653607ffff641e0a0fff7 SHA-256: 7bff63f68e61abe45035cd468a39904ce04040df68e1eef023bd09c4be4250d2
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM', suggesting it's designed to redirect users to numerous potentially malicious or SEO-manipulated websites. The embedded URLs, such as 'https://jacksth.ru/strik?utm_term=what+happened+to+beatrice+baudelaire' and 'http://badoxik.scienceontheweb.net/how_to_lean_body_mass.pdf', are key indicators of this phishing or link-farming attack pattern. No scripts were extracted, but the PDF structure itself is weaponized to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=what+happened+to+beatrice+baudelaire
    • http://badoxik.scienceontheweb.net/how_to_lean_body_mass.pdf
    • http://vugaganopofom.mypressonline.com/tedofogo.pdf
    • https://cdn-cms.f-static.net/uploads/4497650/normal_6017fa8a3d044.pdf
    • https://cdn-cms.f-static.net/uploads/4472788/normal_602b3e69c730e.pdf
    • http://gapagal.mywebcommunity.org/5475108014.pdf
    • https://cdn-cms.f-static.net/uploads/4454161/normal_6049d35623bab.pdf
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5fc9d66f82c6a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/526b4773-2c0a-4128-9c27-eb79ba48b011/organic_chemistry_as_a_second_language_5th_edition_reddit.pdf
    • https://uploads.strikinglycdn.com/files/7e9d24b9-b9ba-4031-82b9-dad5cb3ecfa4/palitot.pdf
    • https://uploads.strikinglycdn.com/files/6b2f200d-820b-4ed3-b256-0791aff9ba67/how_to_read_music_notes_fast.pdf
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_7aa2eea9e7d5497bb7cfa84bdc4f4df3.pdf?index=true
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_40d082a1e8e843598a715f2a27750c51.pdf?index=true
    • http://dijuvunote.onlinewebshop.net/epochenberblick_aufklrung.pdf
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_47df5dffdc234fbd83cae31ba0054c6d.pdf?index=true
    • https://s3.amazonaws.com/sitozi/rowiko.pdf
    • https://s3.amazonaws.com/vavale/luwevirajojazagob.pdf
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_d479f7a3c6a143ad8e60ab53d72323aa.pdf?index=true
    • https://s3.amazonaws.com/fujadabez/bikuguzezider.pdf
    • https://s3.amazonaws.com/gidibesuxi/wisesitiketifajor.pdf
    • https://uploads.strikinglycdn.com/files/d311c606-292e-4885-adad-d8d28d1fef90/taco_bell_creamy_chipotle_sauce_nutrition.pdf
    • https://uploads.strikinglycdn.com/files/d2aea683-49a3-4e9c-9eee-22efcf38d90f/kusitamenukijo.pdf
    • https://s3.amazonaws.com/lovetijif/jeveviwosuxopojukezeni.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000124d8.bin
3c2dc1000267042446b05e35270da19de597dc2b1d5e90c34eafbb079cd79cd9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x124D8 16888 bytes
font_00_sfnt_off0000eebb.bin
f980a86ff48240baa4c48ee0668db96498e6e8bb25fa1da0426a178d2ab41266		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 5136 bytes
font_01_sfnt_off00010034.bin
887f8e701ef6073c5bd2bec9ce5dec2a8686b0d21ca914eab99c1a0af2a5f576		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 10604 bytes

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