Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f287c20acba77c3…

MALICIOUS

PDF

68.1 KB Created: 2021-02-15 18:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7fe50dc2a54144a858fd5586d317101a SHA-1: 69e1388c37903680b0fe9795eb670992efee3fe8 SHA-256: 5f287c20acba77c322a22a3697637b65b28e298097acade722a30134cbeff996
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. It contains numerous embedded URLs, including one that appears to be a redirector with UTM parameters, suggesting an attempt to drive traffic to potentially malicious content. The document body, though heavily obfuscated, contains text related to a 'pokemon fire red walkthrough pdf free download', indicating a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=pokemon+fire+red+walkthrough+pdf+free+download PDF link annotation
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/2124278.pdfIn PDF document text
    • http://shop-profildoors.ru/php_programmingkec8p.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/77geiic/97246979266.pdfIn PDF document text
    • https://cdn.sqhk.co/dosazuleg/ekhh1ja/easa_pilot_logbook_excel.pdfIn PDF document text
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/kosuve.pdfIn PDF document text
    • http://center-about.com/calibri_bold_regular_font_freeeu2j7.pdfIn PDF document text
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/zixovopuxora-xelusoliwe.pdfIn PDF document text
    • https://pabelazulutibus.weebly.com/uploads/1/3/1/0/131070827/marufapuma.pdfIn PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/fufidosifiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/geM6hji/dekiwapemejejis.pdfIn PDF document text
    • https://sutulozutujak.weebly.com/uploads/1/3/4/8/134884412/molenaxedi.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/xiduvix_gulubolusi_kivokaxib.pdfIn PDF document text
    • https://cdn.sqhk.co/buruvalufe/gihYayD/80_s_songs_hits_youtube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suziwifu.rf.gd/50869177167.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_off0000cb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1A 5432 bytes
SHA-256: 8924599f1c9ccf761839af4269d318ec58b93b7bd21c11dcdcd14335fafd5613
font_01_sfnt_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 11204 bytes
SHA-256: 3d3ef4a9ce5281bca4e01a6edf2347dc3d791106a49c99eb40cedd391be1833b

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