Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c86ed97ef1efb2…

MALICIOUS

PDF

73.0 KB Created: 2021-03-11 17:11:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e4d2c6e582c45ca0b37df9cc195ae21c SHA-1: 0e5d807012b1b5186f82f3d3e94b043444987ab1 SHA-256: b1c86ed97ef1efb260177952d33e2d9cc5c7a8175203b11bc0e5ddad9d81d101
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains numerous embedded URLs, with a primary focus on directing users to 'gimoguvi.ru' under the guise of providing financial management formulas. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/strik?utm_term=financial+management+ratios+formulas+pdf PDF link annotation
    • http://nisiwitas.22web.org/12th_ncert_biology_textbook.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/hf4kKgj/box_heads_2_y8.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoletef/hjAjaVf/xabimijuxunobopajokun.pdfIn PDF document text
    • http://taxurofetizi.22web.org/fahes_technical_inspection_report.pdfIn PDF document text
    • https://cdn.sqhk.co/pumevigatare/gWL8hdp/vitif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xamudakosenezi.rf.gd/guess_bts_song_emoji_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2fbdf11-a026-4448-ad31-7df357542154/47544540933.pdfIn PDF document text
    • http://makowadoka.epizy.com/pharmacy_business_math_formulas.pdfIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_478607283bd14778874237a2614727cd.pdf?index=trueIn PDF document text
    • http://tujejutid.rf.gd/2459009046.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_4eb877fc439a49c8ac7089206026fe61.pdf?index=trueIn PDF document text
    • http://lemagokumir.epizy.com/1707206710.pdfIn PDF document text
    • http://suvogiwuxibi.epizy.com/bournvita_quiz_book.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_4a5364c447334b759c37e18eb2f24d8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9cd0582-a45a-4d2b-b623-4121f3d1acdf/14678493738.pdfIn PDF document text
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_0a825b4ea7844a71bbcccd2c63d9ac6b.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_1de4b9350887443c8565275b87284a9f.pdf?index=trueIn PDF document text
    • http://davojuke.epizy.com/fakibegereseduvazogefur.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 5432 bytes
SHA-256: 6eb267d15428789ae15b90da9df714afb2e7fefe0e3bb6dfdc4a969593bfcb0a
font_01_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 11184 bytes
SHA-256: 5d1522f643f5da8222fc4240ffd2f72df6534714acdcaa71b38e5a6833a40dfa

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