Malicious PDF — malware analysis report

Static analysis result for SHA-256 91721d86036dfcef…

MALICIOUS

PDF

112.3 KB Created: 2021-02-19 07:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 803e4e13d52e1b26184fa2f75c6a06e4 SHA-1: e70fb34adfd5dfb9ef06ab104f959b25624567fa SHA-256: 91721d86036dfcef5a17897e92b9069e8dcc26eb4a19b19ac5c22eb3a6de8a90
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The PDF contains a large number of external links, suggesting it functions as a link farm or SEO spam document, with one URL pointing to a potentially malicious domain (baarspo.ru). The presence of a callback phishing lure heuristic indicates the document may attempt to trick users into calling a fraudulent support number.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://baarspo.ru/wix?keyword=hot+snapchat+bitmoji PDF link annotation
    • https://gakafapokizi.weebly.com/uploads/1/3/5/3/135319358/a970d4f.pdfIn PDF document text
    • https://cdn.sqhk.co/silutoge/cihmRFE/ragnarok_tactics_sea_reroll.pdfIn PDF document text
    • https://cdn.sqhk.co/mudemodox/jgqEghO/rikovixofo.pdfIn PDF document text
    • https://rugalasaludazi.weebly.com/uploads/1/3/4/6/134683923/kokezikirarazi-xuremamox-ratotivofani.pdfIn PDF document text
    • https://cdn.sqhk.co/wezikinupig/gihgegh/crazy_zombie_v9._0_super_heroes_3.pdfIn PDF document text
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/lopexuwonep_jonenidul_gozonozulo_nozeneworu.pdfIn PDF document text
    • https://cdn.sqhk.co/sumefixes/xjhOifB/28438099413.pdfIn PDF document text
    • https://bofuvuwowu.weebly.com/uploads/1/3/1/8/131856225/5731372.pdfIn PDF document text
    • https://pemejelusapi.weebly.com/uploads/1/3/1/3/131398576/e2546c81e.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/pavujiniz/fokamogebageweko.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/pigerep.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/alcohol_tester_at6000_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/gukuseba.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/90875749669.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/app_store_not_ing.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_off00017bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BB7 5224 bytes
SHA-256: 345e0915fd77d40a1545bcb84324b22c5bded0923190fe6a18a9e679bed62073
font_01_sfnt_off00018d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D52 11428 bytes
SHA-256: d6e8add6aa116d471e40a920c14209cc3ed7ceb99178c4f8eecae6650e220c24

Open this report in the interactive analyzer, or submit your own file for analysis.