Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b922b3612b74c82…

MALICIOUS

PDF

78.7 KB Created: 2020-11-24 05:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 93e450a1e507d895a91751d03c97513f SHA-1: db91fc5e1797d74d366be1a75a79190b718e867b SHA-256: 8b922b3612b74c8223e03baff13058744883d1b0c600c3eedad5e1e854692674
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting services, and one specifically identified as a malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. No scripts were extracted, but the primary attack pattern involves directing users to external malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://ggtraff.ru/strik?utm_term=mstar+isp+utility+v4+5.9+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_5fa57d2ccf0ca.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/6391395.pdfIn PDF document text
    • https://bavobero.weebly.com/uploads/1/3/4/5/134585538/13a6c48c7.pdfIn PDF document text
    • https://natufebopod.weebly.com/uploads/1/3/4/3/134305275/1950711.pdfIn PDF document text
    • https://vomilanusasapik.weebly.com/uploads/1/3/4/4/134478463/26b99c0a2.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/80e3736b02a2.pdfIn PDF document text
    • https://leponinidokawe.weebly.com/uploads/1/3/4/5/134502666/wudivozufunutop-belalup-luzufapupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5f9c7e8fdf253.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/libeganot/tixid.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/besitivota.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/answers_yahoo_ramadan.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9E 7104 bytes
SHA-256: 62c4600d5ac56950c95f71c8791cb2b96557b97d865727f2a2582a910bd22f44
font_01_sfnt_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 5376 bytes
SHA-256: 1eca4f23e9be7d856000cfca19043daa774f8b2d7e4017a2cc0a3895e7dfdd67
font_02_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 12580 bytes
SHA-256: b806b9fa9d88371b96397eed28152055fb58dccac832bb5ad898946f3f4e4b30
font_03_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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