Malicious PDF — malware analysis report

Static analysis result for SHA-256 179f58fe9fcb5e1e…

MALICIOUS

PDF

82.8 KB Created: 2021-03-03 20:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d6060098bd38663f14282be233522103 SHA-1: 2ac03dd50938c05cd271359a8fe702dcf04fd9c1 SHA-256: 179f58fe9fcb5e1eebd5a0621c2a85bdaded6d9798569d65e4e778d1ae536242
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and an ML classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. It functions as a link farm, containing numerous external links to other PDF files hosted on disposable domains, likely for SEO manipulation or to distribute further malicious content. The primary URL observed is https://golowaki.ru/wix?keyword=honeywell+th8320r1003+installation+manual, which appears to be a lure.

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://golowaki.ru/wix?keyword=honeywell+th8320r1003+installation+manual PDF link annotation
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/sedumi.pdfIn PDF document text
    • http://zogagutezuwe.22web.org/degezuzupuxiva.pdfIn PDF document text
    • https://tijikazi.weebly.com/uploads/1/3/4/3/134373218/novatipupofipen.pdfIn PDF document text
    • https://sixikubirosepup.weebly.com/uploads/1/3/3/9/133997641/93ea86ad6fa9.pdfIn PDF document text
    • https://penaxixix.weebly.com/uploads/1/3/0/8/130813526/pirovifemovesoli.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/ad6c8b21afea.pdfIn PDF document text
    • https://supuniwugi.weebly.com/uploads/1/3/5/3/135317388/5f849af7ed3ed78.pdfIn PDF document text
    • https://velelamoju.weebly.com/uploads/1/3/1/4/131438442/541cf5.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/rovuwazejeg.pdfIn PDF document text
    • http://bitipusefotas.66ghz.com/13640072622.pdfIn PDF document text
    • https://bejelasinodajib.weebly.com/uploads/1/3/4/7/134764461/6116741.pdfIn PDF document text
    • https://xatoxelal.weebly.com/uploads/1/3/1/4/131482937/bd1b45a2c3549.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/vetamedisoz/bicycle_thieves_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/81068194043.pdfIn PDF document text
    • http://mufozugiro.rf.gd/datelogopejevidukenesaj.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/gumojulamarol.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_off0001049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 5764 bytes
SHA-256: beef71dd2ecb4dd1b19173b2469aef3f919417eecacb810b34a04f9368e34ab2
font_01_sfnt_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 10976 bytes
SHA-256: 90998aea3a01ee443e51e1bba188ef45e0af3a7e73bf4bbd746530dd902aacb0

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