Malicious PDF — malware analysis report

Static analysis result for SHA-256 987c185a5a328a75…

MALICIOUS

PDF

83.5 KB Created: 2021-04-01 15:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f7accc0c93d9c2fd45556d98c693ff5a SHA-1: 8394642bd8e80945a80745c7b8247da6cdad8036 SHA-256: 987c185a5a328a757379168ad247510be8b9259203ff62ad57e2585496bfe242
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://botokaw.ru/strik?utm_term=arris+cm820+router+login, which is likely part of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=arris+cm820+router+login PDF link annotation
    • https://mavitebe.weebly.com/uploads/1/3/1/1/131163983/mefozilulewo.pdfIn PDF document text
    • https://cdn.sqhk.co/jelasusoved/hihhzzp/3d_galaxy_live_wallpaper_download.pdfIn PDF document text
    • https://venozosuvizulul.weebly.com/uploads/1/3/0/8/130814909/gabupuwoxaputiga.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/DifF3lW/average_prices_for_life_insurance.pdfIn PDF document text
    • https://cdn.sqhk.co/temetixufuxi/ieNgfjj/xijifegigubij.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/f9ERhg7/pinballz_lake_creek_go_karts.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/hfjcnJV/uk_police_siren_app.pdfIn PDF document text
    • https://vukedezesul.weebly.com/uploads/1/3/0/7/130776134/4527bd8a45a4743.pdfIn PDF document text
    • https://paxowudozu.weebly.com/uploads/1/3/6/0/136095727/wapobi-fekajaze.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/djbuggC/covid_alert_nj_ny.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/zevofivabe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_5f7fb359e7d44df3ba6c51781f9ac0c9.pdf?index=trueIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_604a35885ac646938427b6e3d07ad7a9.pdf?index=trueIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_c83b03eb462a48c595e893237af21ab7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c514ec-5f68-42aa-a9b9-8d4926e05bb4/fresh_wind_fresh_fire_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4f8f03-0077-4da1-9614-7c7061673ba5/cpc_study_guide_-_2020.pdfIn PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_4afd21c85145414185ae339a622b81dd.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 5248 bytes
SHA-256: 90e6416fb615a5c0248c13e9178a94cb0118a14e72fc9b695d47b95d48190b36
font_01_sfnt_off00010bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 11316 bytes
SHA-256: 055ff2bf0dba71aa76c0cf3ba64b85702ccc948e09c19fe39e016acca2a19b7c
font_02_sfnt_off000132b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c