Malicious PDF — malware analysis report

Static analysis result for SHA-256 631bd7d8c840fa30…

MALICIOUS

PDF

75.5 KB Created: 2021-01-12 14:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2dd8327788a32f195160d15fcab3d7d8 SHA-1: 7577d9ecb91e9580a7b4e2c678469bee859b6cba SHA-256: 631bd7d8c840fa30166f4fa57d41bb410c45d44d984d5e140f5c5913844eff28
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs likely lead to malicious content or further phishing attempts.

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://trafffi.ru/aws?utm_term=hike+messenger+for+pc+free++software PDF link annotation
    • https://jujodupif.weebly.com/uploads/1/3/2/3/132303189/30cdee7.pdfIn PDF document text
    • https://site-1175466.mozfiles.com/files/1175466/fantasy_premier_league_gameweek_5_captain_tips.pdfIn PDF document text
    • https://xizilajonufu.weebly.com/uploads/1/3/4/5/134528384/rikodavel.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/vevinuvog-gunatexetegal-setigebolamero-filesalepagume.pdfIn PDF document text
    • https://sezavifibeka.weebly.com/uploads/1/3/4/4/134463458/4393860.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/5497151.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/sawibupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f86f94b367b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_5f8f89934ba37.pdfIn PDF document text
    • https://judexibegajojid.weebly.com/uploads/1/3/4/8/134885636/xevagojabagobi.pdfIn PDF document text
    • https://site-1192597.mozfiles.com/files/1192597/gejuzazakaxawuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382209/normal_5f92b5fa4b71c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387577/normal_5f9f0517f255d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403263/normal_5fe4b6e7486da.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/jamokaroxoj/31230930684.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_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 5420 bytes
SHA-256: 53b4fed293b04242b9400aa768e987e188adafad87f66960a4db075e362f6594
font_01_sfnt_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 10548 bytes
SHA-256: 4d8ad3c236428ea038b081365c67ef1284d0634022a7ec7132b8f9bbc311dc4a

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