Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d79f72a98a3b41…

MALICIOUS

PDF

73.2 KB Created: 2021-02-14 19:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0113d6fce7369668ee0d91542030fde8 SHA-1: 460d7d9eebced9255682d241dd8120feb25932e0 SHA-256: 37d79f72a98a3b4166cd91e7d20a8b5b1d9dd364fa9b78583d7465fbb357a24e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The embedded links, such as 'https://yafferge.ru/aws?utm_term=assamese+song++video+2019', are designed to redirect users to potentially harmful sites, aligning with phishing and drive-by download attack patterns.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=assamese+song++video+2019 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4424331/normal_5fddf4783b2db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390081/normal_5ff426bfc3ed0.pdfIn PDF document text
    • https://cdn.sqhk.co/jozanafe/ihanjfF/didipategan.pdfIn PDF document text
    • https://cdn.sqhk.co/firokizita/ijdMieF/12021953075.pdfIn PDF document text
    • http://thelandofbadideas.com/jidot9n0h6.pdfIn PDF document text
    • http://sodahq.pro/laroxujakidgabp6.pdfIn PDF document text
    • http://bit7.top/grindstone_lake_hayward_wi_fishing_report28lkt.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetijesi/ejbgcgN/36147397154.pdfIn PDF document text
    • http://1xbet-registr.site/5401818350xc2yv.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/eA1he0E/chinese_drama_2018_modern.pdfIn PDF document text
    • https://cdn.sqhk.co/pukefoxer/gdVmEiI/2539701730.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/baby_cot_sheets_adairs203lv.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/fosagoba/makro_specials.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/ceac._state._gov_form_i-_864.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_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 5548 bytes
SHA-256: a25c9013fa1560bcc555094afc5b42916ec249fd09a64f02dfc34d6ff7bd52d7
font_01_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 11408 bytes
SHA-256: 5abe82411dbf76ca32f4447d75bb45b33af736835b4edab29d570fec640aca32

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