Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcf0878a85f3a61…

MALICIOUS

PDF

68.1 KB Created: 2021-02-15 07:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 45316587988473988720a9777cdb5db0 SHA-1: 1852b7b241580ebe77b38f24691800341fbfe93a SHA-256: 5bcf0878a85f3a61d31446522b0610dfc1e30ffd211ba3eae01b09336386db37
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for a redirector link to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URL points to 'yafferge.ru', which is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://yafferge.ru/123?utm_term=michele%2527s+estate+sales+albuquerque In PDF document text
    • https://static.s123-cdn-static.com/uploads/4495975/normal_600728f4f21b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_601ef07444e52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382965/normal_5fcbde77e589a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501204/normal_5feed30c413ce.pdfIn PDF document text
    • http://sfr-espace.best/25953245174beyxf.pdfIn PDF document text
    • http://zalavsky.ru/ejemplos_de_terminos_categorematicosfbd9o.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/d8296f967.pdfIn PDF document text
    • http://zhigina.ru/romexuvaxepegarafavif42b1z.pdfIn PDF document text
    • http://piguzipudoval.iblogger.org/10_ejemplos_de_actos_juridicos_informales.pdfIn PDF document text
    • http://bestsalestoday.xyz/nudizozogonixileropivizeyzvpx.pdfIn PDF document text
    • http://formulamoney.top/speak_americano_songuu92j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tizugixe.epizy.com/19920973929.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/mogupaxubelunuru.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/57429760479.pdfIn PDF document text
    • http://gekazez.epizy.com/rawidemugipinifamopovi.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/kasiru.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE35 5192 bytes
SHA-256: 5decddfb85ce4bbc40b3fe35b5723df734180e2e12b86dd831229c3d06e6a66c
font_01_sfnt_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 10472 bytes
SHA-256: eabb77621463b3de2bb00f781583c6c058a6f20c1cd77fb4bf68f2b6ee004dab

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