Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f245f02870fc136…

MALICIOUS

PDF

70.4 KB Created: 2020-11-24 15:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd65f46aeccd86f0c3d3a54a82a9a42a SHA-1: 6c55a6eb77ac77ef0561a3e9e81ee38fcd9b67be SHA-256: 5f245f02870fc136b47742fb13fe4f608be4aad0b8e09fc49c7386283ff002a9
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm or distribution mechanism. The ML classifier and ClamAV detection further support its malicious nature. The primary IOC is the redirector URL, which is likely used to funnel victims to other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=electron+configuration+for+lithium+science
    • https://cdn-cms.f-static.net/uploads/4385648/normal_5fa78de57c04e.pdf
    • https://cdn-cms.f-static.net/uploads/4481400/normal_5fa840f8c365f.pdf
    • https://juleverut.weebly.com/uploads/1/3/4/4/134488806/ponetosuxukerobun.pdf
    • https://cdn-cms.f-static.net/uploads/4481540/normal_5fb556f37cd5c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/92d132d9-ab60-4c1a-85d9-3f95ae0225c3/59345694805.pdf
    • https://s3.amazonaws.com/xurixado/activate_workbook_and_sheet_vba.pdf
    • https://uploads.strikinglycdn.com/files/f775f2ec-a475-4b05-b977-679625d21a59/a_simple_network_of_capacitors.pdf
    • https://uploads.strikinglycdn.com/files/4dbae089-6967-4f7c-9649-7815f7a09ee1/25576941522.pdf
    • https://uploads.strikinglycdn.com/files/32c964a4-8fb5-4406-8fe3-f8963b89841e/nuzabapi.pdf
    • https://uploads.strikinglycdn.com/files/7d991cf9-ec60-479d-b707-788d85b74d41/playboy_july_1982.pdf
    • https://uploads.strikinglycdn.com/files/5d113c20-15dd-4864-9034-943563201f55/data_and_computer_communications_wil.pdf
    • https://s3.amazonaws.com/legobegutulo/59697256918.pdf
    • https://uploads.strikinglycdn.com/files/b8c0498e-18f8-44ae-8190-b0568a8b5a4b/40548746790.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3df.bin
3b41ec5d594429c4dabe03ba4f487e1a7c3b9db2ce73f0f728e8965bc1ce86cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DF 5252 bytes
font_01_sfnt_off0000d599.bin
883e882673afc1b7195cacddae28ad900ed979a063b4911d55a3ac686daa7e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD599 10148 bytes
font_02_sfnt_off0000f763.bin
a1e2968ca8c7638dd4bef022e186f3fea2b098bc52bbc7b81535a6634822059c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF763 16060 bytes

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