Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7728a4d6f87b20f…

MALICIOUS

PDF

89.1 KB Created: 2021-04-11 01:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b8fff8bb99821f9a3d294c6c573a2dd6 SHA-1: 28714426d01f6aee1503bef05282d5346abbb53c SHA-256: c7728a4d6f87b20f9c4af9e1fee90f3f2731f7ba60624608a9b5a7857f8f9ae7
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1059.001 PowerShell

This PDF document contains a lure to trick users into executing commands, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. The document also hosts a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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=how+to+fix+a+milwaukee+battery+that+won%2527t+charge PDF link annotation
    • http://mon-cmbretagne.com/adp_pay_stub_templategrbbf.pdfIn PDF document text
    • https://cdn.sqhk.co/balapakufogo/IThjgj8/85000875976.pdfIn PDF document text
    • http://vir-tus.com/91533907485j8q3u.pdfIn PDF document text
    • http://sneakerspapa.store/why_is_my_xbox_360_not_connecting_to_xbox_liven5fha.pdfIn PDF document text
    • https://dikurowewo.weebly.com/uploads/1/3/4/8/134893632/kijulege-zuzovevawe-xiruvomefekaf.pdfIn PDF document text
    • https://pokekuxabinupar.weebly.com/uploads/1/3/4/0/134016783/6417697.pdfIn PDF document text
    • https://suxamoka.weebly.com/uploads/1/3/4/8/134876373/ba74e47ae8d4.pdfIn PDF document text
    • http://sport-stavki.fun/line_6_hx_stomp_vs_pod_gogfhn4.pdfIn PDF document text
    • https://cdn.sqhk.co/pavupaken/YeHhiNU/chop_chop_ninja_episode_13.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/hcBziaR/21644485531.pdfIn PDF document text
    • http://wrestling-mma.com/attack_on_titan_season_4_manga_final_chaptercg5nc.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/YEjgMr1/football_manager_2020_touch_inter_miami.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/zjgiehh/rally_runner_endless_racing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/a1c_chart_based_on_adag_formula.pdfIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_0a9e7540da8b48ff8f01ca486736efe6.pdf?index=trueIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_1eb2479bebba4e9fb4eadbee2d960b5a.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_7c27304f6b4c439a86d49da1d0ee007d.pdf?index=trueIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_edd14e55b69541ffa2e4d1ed6a7099f8.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_1e11996987074ddb9cb205c74b388a6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/annoying_crossword_clue_answer.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_bb33d3fd002b48e7b549715dd3a68158.pdf?index=trueIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_0674afc2a7ee4baca9f0ab7cbe3c0523.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/segobigilapeninugolefelu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001199c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 5580 bytes
SHA-256: 5f48156367078f4c6f6503f81bcd3d0e8dd3fabbf538022b31507f62a0541bec
font_01_sfnt_off00012c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C96 12348 bytes
SHA-256: 05f7ae8cb1795088b021d24481e9f8ddbca1654b78ba0682d52f60b838a3caa8

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