Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f8aa09f0c6942b…

MALICIOUS

PDF

86.2 KB Created: 2021-04-20 06:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 872b3e9fd197343aaf61ecd8f6c5c946 SHA-1: cd689b8fee039e6963eb59ee6489bc5805eee0a7 SHA-256: 26f8aa09f0c6942b61681a120923368ba7a5fd8c7596931394353c27677c9ad6
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious or disposable domains, indicating a link farm designed to lure users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the presence of a known malicious redirector URL suggest an attempt to lead users to a compromised or malicious second-stage resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+much+are+piebald+dachshunds
    • http://xegazinijitup.mywebcommunity.org/6698378982.pdf
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/tenugokenofat.pdf
    • https://mubonunegaj.weebly.com/uploads/1/3/0/8/130874179/2952308.pdf
    • http://nuveclovet.xyz/luroxupazusekizaviladabqqpzw.pdf
    • https://bawapumur.weebly.com/uploads/1/3/4/4/134466187/kodanipagumosiw.pdf
    • https://pakurematumomu.weebly.com/uploads/1/3/4/7/134764434/4529824.pdf
    • http://kemutedetabu.scienceontheweb.net/american_english_file_2_workbook.pdf
    • http://navalny.design/how_to_reset_a_nextbook_laptopowsun.pdf
    • http://velesvoyage.ru/driver_booster_4._4_license_key5efev.pdf
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/16baecf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_b48f1d792a19461bb2ad2d5b12399322.pdf?index=true
    • https://s3.amazonaws.com/metubevozisul/81363338012.pdf
    • https://s3.amazonaws.com/lumixi/nifafowifidapo.pdf
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_39e7dfac69d94cffb1dbfb84389909b7.pdf?index=true
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_f9176fd04f58439d9dcd12ac4fdb6afb.pdf?index=true
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_9adfd54230e24fcc82322aa2fe557431.pdf?index=true
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_52d337e2e554493cac0e584d15497f37.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011413.bin
3d1f3e18f0d45a90ad3df24d4d99450e0765f46c75b6891138c56b481abdfcc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 5504 bytes
font_01_sfnt_off000126a0.bin
8588a689d30ac15a71ac57669f8ebc4c26e6148cf5d3affcccbb39367f8a769c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 10716 bytes

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