Malicious PDF — malware analysis report

Static analysis result for SHA-256 76511020a6c48db3…

MALICIOUS

PDF

79.0 KB Created: 2021-03-28 16:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9cff948cf6878e216a1238397713afe5 SHA-1: 4336d784e7ec33e2c82ceeffeed4476c326ee6cf SHA-256: 76511020a6c48db328d338e17c683f6bf9d8cc5d4e7300de41dc77137e44657f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDF files, likely for SEO manipulation or to distribute further malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://ponafet.ru/wix?keyword=fertile+crescent+worksheets+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452599/normal_600167ebc4050.pdfIn PDF document text
    • https://xulakuvoloja.weebly.com/uploads/1/3/0/8/130813987/luwufe.pdfIn PDF document text
    • https://japilulijerimu.weebly.com/uploads/1/3/0/7/130738614/6fd01808702.pdfIn PDF document text
    • https://gizomedapirev.weebly.com/uploads/1/3/1/4/131454265/navuzasobafoner-dawiruw-gukevusotagut-wuvisiwojipi.pdfIn PDF document text
    • https://gefetejumifigo.weebly.com/uploads/1/3/4/6/134688955/1362175.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/19c676363cb29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500208/normal_5fce864e241ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_600b8f7faac75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_6009e7dfdf92c.pdfIn PDF document text
    • https://sosedegif.weebly.com/uploads/1/3/2/8/132815053/wokukizomu.pdfIn PDF document text
    • https://zewurutivuzaned.weebly.com/uploads/1/3/4/8/134888434/denufaxaribufizo.pdfIn PDF document text
    • https://wedidosav.weebly.com/uploads/1/3/1/6/131637371/fupozebikemepuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496605/normal_605da4e3c6816.pdfIn PDF document text
    • https://vewenaloviriwu.weebly.com/uploads/1/3/2/8/132816087/973293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5fe265f40c028.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/antologia_cuentos_cortos.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/the_origins_of_the_modern_world_summary_by_chapter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 4932 bytes
SHA-256: 66bc935d6e5c89431092a8413245ce918a457e7b59c34631bdc501915f4ea4ab
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 11320 bytes
SHA-256: 25b34a4151aeba29b2e474262ab6cce0498ba0d669ee62a69f3b79453013fc66
font_02_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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