Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f670db81f54502…

MALICIOUS

PDF

72.8 KB Created: 2021-02-04 06:29:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a8ce8c3b8162999e7eaec81c3a3305be SHA-1: 15c637e1618a6c52498b4bf6c4bf9e9a76ab84cc SHA-256: d1f670db81f5450218c851233df591ad428bd83a36e3a1bf5095dfc065765b3d
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external websites, many hosted on disposable domains, under the guise of search results. The document's content and structure strongly suggest an attempt to deceive users into visiting potentially harmful sites, likely for further exploitation or credential harvesting.

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://maypoin.ru/123?utm_term=what+is+a+single+replacement+chemical+reaction PDF link annotation
    • https://dexejajakoto.weebly.com/uploads/1/3/0/7/130739268/3f447b.pdfIn PDF document text
    • http://naturka.space/sorokanori02is.pdfIn PDF document text
    • http://pushbiz.fun/ferdinando_carulli0kfy0.pdfIn PDF document text
    • https://jefiwosu.weebly.com/uploads/1/3/1/3/131379536/5347306.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411708/normal_5fed935886819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465149/normal_5fe530633d61c.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/2156110d.pdfIn PDF document text
    • https://nedixizudunosil.weebly.com/uploads/1/3/1/4/131483200/728092.pdfIn PDF document text
    • https://fepexugoroba.weebly.com/uploads/1/3/4/4/134469665/zibepowoxiru-tepod.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxazigozo/qiige4F/4876203711.pdfIn PDF document text
    • https://bumekutuwa.weebly.com/uploads/1/3/1/4/131452846/646bb7c19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_5fd638cd77225.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/numomuvakegaxow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480585/normal_5ff44e1f557bb.pdfIn PDF document text
    • https://lozofuxoxezutuw.weebly.com/uploads/1/3/5/3/135303337/50254d990854f3.pdfIn PDF document text
    • https://polemezal.weebly.com/uploads/1/3/1/4/131452876/1eeac.pdfIn PDF document text
    • https://jajonugofetafis.weebly.com/uploads/1/3/0/7/130776034/buwokituk.pdfIn PDF document text
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/fejakezuwomipuli.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
    • 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_off0000d2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 5148 bytes
SHA-256: 74e2b21a84b4d2a3cee26addfda7a502c26f20bfb1a0b880ff0bb87500a4bb8e
font_01_sfnt_off0000e41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 10372 bytes
SHA-256: 991d5ca595ae215b2018e6dcf45acf7ec77f4416c3de34438a20adf2db7687c1
font_02_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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