Malicious PDF — malware analysis report

Static analysis result for SHA-256 f914545c31fec282…

MALICIOUS

PDF

83.1 KB Created: 2021-02-12 10:28:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 15bc2aced51a6a657d0a4201a7ed7970 SHA-1: 774340d798893fa897099a0283b84d8c89c1469b SHA-256: f914545c31fec282483fc8bed6077e54600316fd1b97df930308d0ed87eb2d6e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to redirect users to potentially malicious content.

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://bologen.ru/wix?keyword=shaun+the+sheep+lost+in+london+crazy+games PDF link annotation
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/4775431.pdfIn PDF document text
    • https://mojivisosodarez.weebly.com/uploads/1/3/4/0/134096231/18b16e.pdfIn PDF document text
    • https://xukovefekafevut.weebly.com/uploads/1/3/0/9/130969731/b3307602be323eb.pdfIn PDF document text
    • https://nexuragero.weebly.com/uploads/1/3/4/7/134751893/nisosuguw_tokidiwinudu_kemavikumix_vomedazovopuxu.pdfIn PDF document text
    • https://wodumipanopova.weebly.com/uploads/1/3/4/7/134731655/e7eb12.pdfIn PDF document text
    • https://xomepuwosabagef.weebly.com/uploads/1/3/0/9/130969083/8047213.pdfIn PDF document text
    • https://pemiroma.weebly.com/uploads/1/3/1/3/131383733/3227670.pdfIn PDF document text
    • http://vermono.site/lawopulitad6emo4.pdfIn PDF document text
    • https://vixagudidiw.weebly.com/uploads/1/3/0/7/130775505/3753583.pdfIn PDF document text
    • https://gojufepegaxop.weebly.com/uploads/1/3/4/3/134339744/d763d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nifekubipaxo.epizy.com/desi_bhangra_dj_nagpuri_song.pdfIn PDF document text
    • http://pipademepazofex.epizy.com/gravity_falls_opening_piano_sheet_music.pdfIn PDF document text
    • http://tiriburud.rf.gd/content_marketing_hubspot_certification_answers.pdfIn PDF document text
    • http://bidilud.rf.gd/blackberry_priv_android_8._0.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_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 5744 bytes
SHA-256: ac73e50609f4adddf02eb42d856b1c861875b6e66ef467366bf4eaa03b8b876e
font_01_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 10520 bytes
SHA-256: eb40921ed1a24c8c357135e9f7cd2415eeddc4e9d1737a449c27a753d75417fa

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