Malicious PDF — malware analysis report

Static analysis result for SHA-256 15afdd3f2959a1c7…

MALICIOUS

PDF

68.7 KB Created: 2021-02-15 22:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ee10431f96459c5cd916d37e7cf1b567 SHA-1: e29fbc17b2de6ed0c35546e3f41fd1e51edd3668 SHA-256: 15afdd3f2959a1c755ebf81b97ca06812fcd1b4b3d03f7a51f3f925b36d3179a
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specific URL (`https://bologen.ru/strik?utm_term=can+you+change+the+band+on+a+fitbit+charge+hr`) appears to be a redirector for malicious activity. Heuristics indicate this is a link farm designed for phishing or malware distribution, and ClamAV detection confirms its malicious nature. The document body, though heavily obfuscated, contains metadata suggesting it was generated by `wkhtmltopdf`, a tool sometimes used to create malicious PDFs.

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 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.
  • 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://bologen.ru/strik?utm_term=can+you+change+the+band+on+a+fitbit+charge+hr PDF link annotation
    • https://selemuja.weebly.com/uploads/1/3/4/8/134893326/zevobapejab.pdfIn PDF document text
    • http://bilapak.66ghz.com/comforter_sheets_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/uvVUjgd/34947325333.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/ygfjigi/fojivanelif.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/iaHzs4E/sonic_4_episode_2_final_boss.pdfIn PDF document text
    • http://xikumidevulofo.iblogger.org/rufus_bootable_usb_software.pdfIn PDF document text
    • https://palobakuk.weebly.com/uploads/1/3/4/5/134523632/b181b4f910ed.pdfIn PDF document text
    • http://fegovoze.22web.org/hypothesis_worksheet_middle_school.pdfIn PDF document text
    • https://fovojewonot.weebly.com/uploads/1/3/4/6/134669065/boniduxis_tivenokolemoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roruvavaderej.epizy.com/melukumunibevudubifu.pdfIn PDF document text
    • http://vapanuwivodoj.epizy.com/world_news_abc_reporters.pdfIn PDF document text
    • http://nupejodolet.epizy.com/acc_aha_hypertension_guidelines_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/9308272243.pdfIn PDF document text
    • http://xalobazinapirep.epizy.com/78481521418.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_off0000ceba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBA 5220 bytes
SHA-256: 7abdf1139494d37c5359c052897130e43cb640327f6856e65cda86d4848a585e
font_01_sfnt_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 10840 bytes
SHA-256: 5a549b3737e27259e87bcddb599fe956e3dee6ae84184cab8f63b4419eee2b59

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