Malicious PDF — malware analysis report

Static analysis result for SHA-256 796be8fc3df3a888…

MALICIOUS

PDF

72.5 KB Created: 2021-01-17 14:10:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6f4a68d7d73328726cef84de08855b38 SHA-1: ecebcf7d2d9fce7c4e6df5da2e8f085b7d938b22 SHA-256: 796be8fc3df3a888671605f1cf0b9401e6b006fe74e6721b85ff9824ad8f06dd
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The document body is heavily obfuscated and appears to be junk data, reinforcing the interpretation that the primary function is to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/aws?utm_term=bhola+nath+re+ringtone In PDF document text
    • https://xupumoga.weebly.com/uploads/1/3/1/1/131164417/1aa9da2b76d.pdfIn PDF document text
    • http://nowatora.22web.org/score_bisap_pancreatitis.pdfIn PDF document text
    • https://lezojefob.weebly.com/uploads/1/3/5/3/135319065/lasolija.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/mafebetaxujewu-vomiwapudapep-lezup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_5faf5f9fb8e8e.pdfIn PDF document text
    • https://legovizadedugid.weebly.com/uploads/1/3/1/8/131856283/vemativaful-febem-mowezafowoteket.pdfIn PDF document text
    • https://tulejimukun.weebly.com/uploads/1/3/4/3/134399478/6768957.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/jogufukoli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490369/normal_60027c37e2c89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_5fb3f690201c3.pdfIn PDF document text
    • https://rupunapu.weebly.com/uploads/1/3/4/3/134354814/wevoxixedomawojunufa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://wubavon.epizy.com/52406000890.pdfIn PDF document text
    • http://jamurujitexezi.epizy.com/junasu.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_off0000c6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FE 4816 bytes
SHA-256: 2c19078010ae9374578ec240c61c1db136061e896990229f2c690c39bd437a15
font_01_sfnt_off0000d75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75C 10156 bytes
SHA-256: ddf9cdc5d9b3558ccfbbde39b077354ae3f53383ffbff68011b9fc8c134c0bb0
font_02_sfnt_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 7948 bytes
SHA-256: da4178fa9cc68d53444859974a8068962019704a26e170d3609155758c5d41b3

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