Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6074af27bb7ca6…

MALICIOUS

PDF

83.0 KB Created: 2021-04-24 07:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c6605b88ad51bc313706697f4cd4d0cc SHA-1: 5a027e505bc69ef56ac3712b0d97746915c4b181 SHA-256: 3c6074af27bb7ca69bb2b0e45018d3f8fe03982198c22d64dec4e9025a3837d1
196 Risk Score

Malware Insights

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

The PDF contains a high number of external links, including a link farm and suspicious invisible links, designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jacksth.ru/strik?utm_term=cannon+80+gun+safe+reviews PDF link annotation
    • https://cdn.sqhk.co/lekusovu/MOhcii8/allosaurus_simulator_dinosaur_survival_battle_3d_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kozutani/39hga1T/65179781769.pdfIn PDF document text
    • https://joziwofu.weebly.com/uploads/1/3/4/0/134012586/fagurijugata.pdfIn PDF document text
    • https://xumebarukez.weebly.com/uploads/1/3/4/6/134687090/xaxemekukadapobugo.pdfIn PDF document text
    • https://nuzibekupin.weebly.com/uploads/1/3/4/3/134338080/vipebunurivor.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/how_to_clean_washing_machine_filter_samsung_top_loaderqeiai.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/jhcWuVc/launcher_minecraft_mod_pack.pdfIn PDF document text
    • https://pexerewiku.weebly.com/uploads/1/3/5/3/135313352/ea07e5.pdfIn PDF document text
    • https://waforavorodi.weebly.com/uploads/1/3/4/3/134314120/192ee55f31c9b99.pdfIn PDF document text
    • https://wifamiwipefap.weebly.com/uploads/1/3/0/7/130738562/33929410c9.pdfIn PDF document text
    • http://makeyourself.xyz/stony_brook_honors_college_vs_univert28om.pdfIn PDF document text
    • https://sopesurikef.weebly.com/uploads/1/3/5/3/135317881/lamabil_juzalijo.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/BtjbcEc/zixebesenifak.pdfIn PDF document text
    • https://cdn.sqhk.co/dugukiser/B2ic0ge/risk_assessment_sheets_construction.pdfIn PDF document text
    • http://dithetsen.xyz/dirt_devil_power_swerve_cordless_stick49rss.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://s3.amazonaws.com/fojaxexino/worafebatefe.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/64875372591.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/wonusijuxowarozolez.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/how_to_use_lg_convection_microwave_for_baking.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/58343535228.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/55899271365.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/29486623285.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/wobuvegezut.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 5216 bytes
SHA-256: 0d9ffdf9b1fa5131b757a980a81f47b0479c3d01cd488390ef97f185dc5dfa2c
font_01_sfnt_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 10784 bytes
SHA-256: b512124a7693b28a589c5a14d142afbc74b217a10534bdf6605d87ce045efcef
font_02_sfnt_off000130ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361