Malicious PDF — malware analysis report

Static analysis result for SHA-256 844a2708dbc9636e…

MALICIOUS

PDF

79.0 KB Created: 2021-06-08 08:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4269fffd8e8787c1e449677d295f6e68 SHA-1: 10d43fcd8189fa5bd15be7b48a55ff6764ef0815 SHA-256: 844a2708dbc9636e741ab9d20e1877fc097665a1045371296ed9ba0bc61384d5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or SEO spam document. It contains a large number of external links, suggesting it is part of a link farm designed to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://archism.ru/pbw?utm_term=percy+jackson+and+the+olympians+characters+movie+cast
    • https://vuloribogisoso.weebly.com/uploads/1/3/4/6/134655424/mofekidumuzebawuwel.pdf
    • https://cdn-cms.f-static.net/uploads/4368243/normal_601de1e3bff65.pdf
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/rexiwi.pdf
    • https://jotozorofelafik.weebly.com/uploads/1/3/1/4/131405965/7653023.pdf
    • https://static.s123-cdn-static.com/uploads/4462096/normal_5feb18e622629.pdf
    • https://static.s123-cdn-static.com/uploads/4413975/normal_5fff44c89a623.pdf
    • https://static.s123-cdn-static-d.com/uploads/4468820/normal_60b706457131f.pdf
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/63696cd1d3e67e.pdf
    • https://lorinifufa.weebly.com/uploads/1/3/4/3/134357706/najuvogikasedo.pdf
    • https://zagozejidenadap.weebly.com/uploads/1/3/1/4/131407028/91aaa734a6.pdf
    • https://rerararomimin.weebly.com/uploads/1/3/1/3/131383042/zomaliwobatabomi.pdf
    • https://cdn-cms.f-static.net/uploads/4450506/normal_60257ca736b94.pdf
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5ff08a573bd2b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fuvesiwowegu.pbworks.com/w/file/fetch/144413883/zenadozokixurokevuw.pdf
    • http://komogabovuwa.pbworks.com/f/fast_and_furious_2019_full_movie_download_in_tamil_isaimini.pdf
    • https://uploads.strikinglycdn.com/files/2b370e7e-fccf-4e44-8a76-1612af8fb31a/keurig_b31_recall_repair_kit.pdf
    • https://uploads.strikinglycdn.com/files/9c484fa9-99cd-42ee-ac9e-0abc707424dc/70563004318.pdf
    • https://uploads.strikinglycdn.com/files/93f32615-4c7f-4c3d-8636-735748badeaf/kikakotemepekirazexufire.pdf
    • http://jadubunid.pbworks.com/w/file/fetch/144635286/tagutarur.pdf
    • https://uploads.strikinglycdn.com/files/fce44072-42d4-4721-af41-d4da8893543c/gagopanefig.pdf
    • https://uploads.strikinglycdn.com/files/28d55711-a219-4e1a-b87f-45ba9f34187f/back_to_eden_book_by_jethro_kloss.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_off0000f69d.bin
526797af2bce76c34062d46a32d3ca43601f810b5982b52f5fa85a9c61d0eae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 5616 bytes
font_01_sfnt_off000109a1.bin
eb4411691b1c9da8a2c06703e76e3c0effb233887af27b8fe938e54b72a9ac08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 10700 bytes

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