Malicious PDF — malware analysis report

Static analysis result for SHA-256 7829a3d4c99136b1…

MALICIOUS

PDF

85.5 KB Created: 2021-03-11 12:03:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b054bd6f616975ab7c010736ed2dd49 SHA-1: d7653d675e7bceaf363e145d0d9d09284e08ecc2 SHA-256: 7829a3d4c99136b16e3bae527735e3ae2f0e4138c1f7a983ae0946640f420153
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm', suggesting it's designed to manipulate search results or redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=baking+tools+and+equipment+and+their+functions+pdf
    • http://xozonline.ru/68557780734ompr0.pdf
    • https://cdn.sqhk.co/voguzasijur/ehijgAm/95208189196.pdf
    • https://cdn.sqhk.co/savageven/ib9hjeS/voice_recorder_app_download_for_android.pdf
    • http://sexedate69.site/88834954576xbqax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_6ebf1106022a4c8fa2e6c9c9ef3bf06f.pdf?index=true
    • https://s3.amazonaws.com/vitelitubovuluj/culligan_water_softener_manual_mark_100.pdf
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_af54f6c02ad54e349d9e48fd77218f82.pdf?index=true
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_31a91dfd0ac94b6db007067e84418fea.pdf?index=true
    • http://xelilurezo.epizy.com/whatsapp_plus_new_version_free.pdf
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_bfeb4d1a7d8d4762b620bdc30defdfd3.pdf?index=true
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_b68309dd714a458aa2a058322e642293.pdf?index=true
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_2c8dec3ca2bd44f2aba43f059bf03db6.pdf?index=true
    • https://s3.amazonaws.com/bezegoluzose/how_to_use_cuisinart_ice_cream_maker_ice-21.pdf
    • https://s3.amazonaws.com/zunewidimem/terixakuwigurugoba.pdf
    • https://s3.amazonaws.com/baritexovopa/avma_euthanasia_guidelines_2018.pdf
    • https://s3.amazonaws.com/baposivarabuj/tezos_solo_baking_guide.pdf
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_253dacdf6ac247fe8304c8f2156c03b6.pdf?index=true
    • http://xadezifu.rf.gd/61769029313.pdf
    • http://vizepojuduw.rf.gd/bivuliruzunidofu.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_off00011057.bin
5c56ec77af15e6830fb704f40ce02d85ff2960ce018e68b5d195fa9af89c5e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 5808 bytes
font_01_sfnt_off000123ef.bin
56047b865806633593baf1be91041be3e313a9fb74673ac1754bcc10ebdb2ea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 10580 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.