Malicious PDF — malware analysis report

Static analysis result for SHA-256 4445f6943cca7997…

MALICIOUS

PDF

63.2 KB Created: 2021-02-20 10:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3b33c5717f3995c4cac758b670c77aee SHA-1: 88c97fb8d70abc46fd36e77b2059a976512bb0be SHA-256: 4445f6943cca7997513937307a905e4297655264e5a0f748ece52f3fe65f2207
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains text related to camcorder usage, suggesting a lure to disguise the malicious links.

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/strik?utm_term=how+do+i+use+my+jvc+everio+camcorder+as+a+webcam In PDF document text
    • http://microbladingeyebrowsdallastx.com/adjective_and_adverb_prepositional_phrases8oytq.pdfIn PDF document text
    • https://jipibivit.weebly.com/uploads/1/3/4/0/134012636/13c03d426.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/osidN9y/97086442968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_6015420f0bd4a.pdfIn PDF document text
    • http://astropsychology.website/gepixeto56m1.pdfIn PDF document text
    • https://zigepavozaw.weebly.com/uploads/1/3/4/3/134349437/1891273.pdfIn PDF document text
    • http://creditreportus.info/neet_biology_syllabus_2018rlr5c.pdfIn PDF document text
    • http://baranaydin.org/94008428694djkf6.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/D0jjjid/23230169235.pdfIn PDF document text
    • http://trokot-roznica.xyz/xokofifabpi6i4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465705/normal_600b560f0fd56.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/ajW46ge/chris_stapleton_new_songs_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tupopozavagaf.rf.gd/33534819532.pdfIn PDF document text
    • http://vaxesopubowutuf.rf.gd/nimuduwiribuziwar.pdfIn PDF document text
    • http://mebabafa.epizy.com/onkyo_tx-sr333_price_in_india.pdfIn PDF document text
    • http://zilaxeputeso.epizy.com/madina_book_1_notes.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_off0000b9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CD 5484 bytes
SHA-256: 3748fc2d43ebd80f07e9f593f4db0b96e2d0fe65b7171b8a93f6c874b545e4b2
font_01_sfnt_off0000cc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC75 10212 bytes
SHA-256: fdf626f1b5fb938c8a268e169abfdeb482c656dfedf9f2f04d478d8a0ab7bb2f

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