Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd10edf98653362…

MALICIOUS

PDF

69.8 KB Created: 2021-04-28 22:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0cdab30c866ceecc7fb34275614d1df SHA-1: 7cd744a74d2e9d041d84659bb0d201625ec20b11 SHA-256: dfd10edf98653362a24e2cae986a04d22abc17a24c9a4c1e5d870fde9e395a27
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://crophysi.ru/strik?utm_term=accurist+watch+sr626sw+price', is likely malicious, while others are benign or unknown. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

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-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://crophysi.ru/strik?utm_term=accurist+watch+sr626sw+price
    • https://cdn-cms.f-static.net/uploads/4412396/normal_604ed3cc240c5.pdf
    • https://cdn.sqhk.co/livaxipovage/hhOcnhj/crossword_solver_python.pdf
    • https://cdn.sqhk.co/gixixutiji/jbictva/pajutup.pdf
    • https://cdn.sqhk.co/japuwejede/7hhRpgf/risanegape.pdf
    • https://cdn-cms.f-static.net/uploads/4406228/normal_606c397b3f5fb.pdf
    • https://cdn.sqhk.co/tivaboloxome/heid87E/78921040081.pdf
    • https://static.s123-cdn-static.com/uploads/4379855/normal_5fd06c566a80f.pdf
    • https://cdn.sqhk.co/vafegijateno/fiaXOhe/tile_wings_match_3_mahjong_master.pdf
    • http://besiditiduw.22web.org/gds_committee_report.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8c89b856-0de1-487c-9339-8dbd04bf53ba/best_site_to_read_marvel_comics_for_free.pdf
    • https://uploads.strikinglycdn.com/files/c75b891a-fb36-4df0-b976-4c94b17a9dd3/39507706176.pdf
    • http://nuridoxiwe.rf.gd/craftsman_1_2_hp_garage_door_opener_drive_gear_replacement.pdf
    • https://uploads.strikinglycdn.com/files/cd01709c-5e4e-4f5a-95a2-4e5c6e5712ca/is_it_possible_to_be_a_black_kpop_idol.pdf
    • http://budekibume.epizy.com/data_science_and_big_data_analytics_mit.pdf
    • https://7292b199-6d7c-4e84-b646-7854114497ba.filesusr.com/ugd/53361e_b9e170c52efb4693890c5f0f958f54bb.pdf?index=true
    • http://xetorofowuwid.epizy.com/tadelo.pdf
    • https://uploads.strikinglycdn.com/files/2d9dd11d-0609-423d-a047-20ac5a4d3982/kotatobobavenafebunagi.pdf
    • http://zimufoduso.rf.gd/magic_bullet_mini_black_friday.pdf
    • http://doledetaxezo.epizy.com/liberalismo_economico_e_politico.pdf
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_15e0008045de4da287b6ec95499f2d83.pdf?index=true
    • 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_off0000d477.bin
95cf9d033116aaab605958209451b3f42c4b854b86db35626936ace165cb89ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD477 5356 bytes
font_01_sfnt_off0000e6bc.bin
f9b37ce9917569d2db075e4031eec7fbd70a407c4ed9bd4271431cf524593028		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 10168 bytes

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