Malicious PDF — malware analysis report

Static analysis result for SHA-256 485cc85a873e2a13…

MALICIOUS

PDF

73.5 KB Created: 2021-02-20 01:17:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8a7d5b3adb6a842b7fb5c6b21e05b0a7 SHA-1: 5fb4fef29549ea14631b020ea1d60d8efcd5f1c5 SHA-256: 485cc85a873e2a13a83486a98a7a1074e689de399463bc6127e4a3f03f5e17d5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=chapter+3+states+of+matter+the+combined+gas+law+worksheet+answers'. This indicates the document's primary purpose is to lure the user to a potentially malicious website. While no scripts were explicitly extracted, the nature of PDF redirects often involves embedded JavaScript to facilitate the redirection. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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=chapter+3+states+of+matter+the+combined+gas+law+worksheet+answers In PDF document text
    • https://cdn.sqhk.co/noxibogalu/igiheqo/kikevojanugavogum.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/vjajiit/spirit_animals_white_goat.pdfIn PDF document text
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/27614233.pdfIn PDF document text
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/9711943.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/dgdggEm/dragon_age_origins_redcliffe_village_walkthrough.pdfIn PDF document text
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/95bf707300073.pdfIn PDF document text
    • https://cdn.sqhk.co/jerizukop/y3Whaji/dungeons_and_dragons_5th_dash.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/jhhfhgC/winking_owl_wine.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/gd8Wngf/80314307278.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/titugome/77967387769.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/android_local_broadcast_receiver_example.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/age_of_war_3_hacked.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/g_shock_watches_for_sale_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/happy_birthday_to_u_original_song.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 5840 bytes
SHA-256: ae912d40840cfb247ab7a8ec27ee353b262c3a5a60f4f917e5b2eec9334fd790
font_01_sfnt_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 10296 bytes
SHA-256: 522a6fb9543e4e5cd00231c629cb49c17f9273de820b3cf9021b1625b7a6901b
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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