Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b274670033421fa…

MALICIOUS

PDF

106.9 KB Created: 2020-12-26 03:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a513d3dd1505b6ffc1cfdc38e291a690 SHA-1: 176ca93867e8b72b0660e96f717126c011aeda06 SHA-256: 4b274670033421faf654212e56624b17c3ff7e7640faf14a2f528238081d2891
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ggtraff.ru'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external links, suggesting a link farm used for SEO manipulation or traffic redirection. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a phishing lure or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ggtraff.ru/strik?utm_term=within+temptation+live+albums In PDF document text
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/150120f7b2e.pdfIn PDF document text
    • https://lujalidulosegex.weebly.com/uploads/1/3/4/3/134369289/motefikaxukepimel.pdfIn PDF document text
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/xevomati_morufaxujerizar_sepozu_zejuzokubeb.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/4741861.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b7c632-47aa-40aa-94a4-3cdc1570c124/vezenimufu.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/cbse_re_compartment_form_2020_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/vehicular_technology_conference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788b0c77-8041-4c5d-ae56-9935c3290772/morph_mod_minecraft_pe_letoltes.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/koxefokiwiziluzifejatoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d41460-0256-4e78-ada6-175a35c9eddc/shaman_king_yoh.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/epigenetic_transformation_ted_talk.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_off00015928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15928 3644 bytes
SHA-256: 39735fed2243cb88c6dedd6a7b3eb9aa1a6288bf72f4c1fee8c4807b4c39a1ab
font_01_sfnt_off00016631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16631 5176 bytes
SHA-256: 40f4795a623dde4e0c33484295916fbd386381076f5c16d14cc408fc5efc431e
font_02_sfnt_off000177b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177B0 11472 bytes
SHA-256: 36a56250714a92f2913b20bed02c9ddb1504ea852d2be3f8139d4d1cf50cd171

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