Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed36c42da0992e7…

MALICIOUS

PDF

65.5 KB Created: 2021-02-18 12:47:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 53dd8acabf4d11298677c467c438ab8b SHA-1: 87f76705a68b30aef73ff0340c808fbeec18ef1e SHA-256: eed36c42da0992e74793d0c1ba22d42a990e72980e135d66eef89644389c89ed
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs and the document body suggest a lure related to search terms, likely to drive traffic to these link farms or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://bologen.ru/wix?keyword=ty+stuffed+animals+with+rattle+inside PDF link annotation
    • https://sinujezujano.weebly.com/uploads/1/3/1/6/131606051/weveviwiteked_talenegogopun.pdfIn PDF document text
    • http://stroymarketmetal.ru/bahubali_2_tamil_movie_ringtonecr205.pdfIn PDF document text
    • https://tinuwese.weebly.com/uploads/1/3/5/3/135300683/4884247.pdfIn PDF document text
    • http://rodina38.ru/87504849159nzwpf.pdfIn PDF document text
    • http://onlinekartiadesi.com/7229840257m0ang.pdfIn PDF document text
    • http://fredo.run/92064597447m9ijs.pdfIn PDF document text
    • https://goxufosoxewuje.weebly.com/uploads/1/3/5/3/135300646/nasup_talododikisomaj.pdfIn PDF document text
    • https://zowololo.weebly.com/uploads/1/3/5/2/135294949/7b173.pdfIn PDF document text
    • http://redit.fun/pupujikorufalif1ph6f.pdfIn PDF document text
    • https://lipodemofuxe.weebly.com/uploads/1/3/5/3/135316225/wixetivosiv-famulilab-lalegu.pdfIn PDF document text
    • https://xepudala.weebly.com/uploads/1/3/4/7/134737014/lexobeze-wefak.pdfIn PDF document text
    • https://xonesomo.weebly.com/uploads/1/3/0/7/130739362/4508451a978f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/lomokasenefoxizibejeke.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/tax_evasion_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/95733900711.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_off0000c63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63D 5292 bytes
SHA-256: 3573196d82e54f89ba8c03ec75c6477253321549812c7c51cd5af561fe03200f
font_01_sfnt_off0000d827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD827 9496 bytes
SHA-256: aee1e01c304497d51b28d8eb423501daf72bd046b1bbbb1b88499e311aac2401

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