Malicious PDF — malware analysis report

Static analysis result for SHA-256 202622523a3dad9d…

MALICIOUS

PDF

70.1 KB Created: 2020-11-13 07:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64d2f7f9b82ec4f6e68f7a43b6c783ca SHA-1: 53495e81577dab772a712c3cd63cc1404e2138cb SHA-256: 202622523a3dad9d5c9498c81f2ef59bfb3cbfad2cfe6bc5c5ccd66911aac921
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, designed to lead users to other sites. One of the initial links points to a known malicious redirector, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=film+review+worksheet
    • https://jiketajaw.weebly.com/uploads/1/3/4/4/134464131/6c8d9bbe.pdf
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/92e234fdb37d.pdf
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/474847.pdf
    • https://ridoduna.weebly.com/uploads/1/3/4/5/134528127/mivopezu_rusewom_besuguke.pdf
    • https://cdn-cms.f-static.net/uploads/4456663/normal_5fa2e6aa9919e.pdf
    • https://purolejomi.weebly.com/uploads/1/3/0/7/130776639/0781c222.pdf
    • https://wavixupenug.weebly.com/uploads/1/3/4/3/134386336/sezevifapugekax.pdf
    • https://fifevogu.weebly.com/uploads/1/3/4/6/134602809/giwewemefa.pdf
    • https://delujopasetew.weebly.com/uploads/1/3/4/3/134399242/denuxowumogena-kotobegisebaveg-jomitetej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/felasorarabipis/add_and_subtract_mixed_numbers_with_unlike_denominators_worksheet.pdf
    • https://s3.amazonaws.com/tosevud/cis_trans_isomers_triple_bond.pdf
    • https://uploads.strikinglycdn.com/files/46dc5095-40c8-49ff-bcf9-88971d674f17/39822904082.pdf
    • https://uploads.strikinglycdn.com/files/e6c402a9-0669-46d3-9c65-b2b72af258de/kiraraxereragolu.pdf
    • https://s3.amazonaws.com/tesasubawalozan/90029690299.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d788.bin
2caf1f5b35ac4d5d1af934c4511aec43c4cd5323507b50feb5b5711cb09890fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 4888 bytes
font_01_sfnt_off0000e812.bin
5bb57a8d95efaeea990dc093879d26b7396208ba1988a7f98c9d76a2d89d7393		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 10344 bytes

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