Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e3dff9e678591b…

MALICIOUS

PDF

77.5 KB Created: 2021-01-11 15:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 257a857d019b2ff15ec11fb3d1c2a6ab SHA-1: b4d26c478d239630d8c382a2da1cda53fc8d8ba7 SHA-256: 68e3dff9e678591b397062425ae0836666e9cec158ddbf8023e9a027e736f23a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. The embedded URLs suggest an attempt to redirect users to phishing or malware download sites.

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://traffking.ru/123?utm_term=usb+flash+drive+1tb+for+ps4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5feb889e8feab.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/9920746.pdfIn PDF document text
    • https://pibazafefudo.weebly.com/uploads/1/3/0/7/130776509/50ea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447086/normal_5fb6e9b95b3e1.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/632ca5f1.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/melafi_somujuk_nakis.pdfIn PDF document text
    • https://site-1194286.mozfiles.com/files/1194286/kowelakigojoderoj.pdfIn PDF document text
    • https://kaxukododeregoz.weebly.com/uploads/1/3/0/9/130969338/pifenuramudex_jopanidire_namerasulujina_lugakesezin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480580/normal_5faf7b006d56b.pdfIn PDF document text
    • https://samabuwe.weebly.com/uploads/1/3/0/7/130739499/nupukunam-datedaj-jidexagopijimo-rovijub.pdfIn PDF document text
    • https://muberelikaxisax.weebly.com/uploads/1/3/1/1/131163953/balepuripifil.pdfIn PDF document text
    • https://pevarigemi.weebly.com/uploads/1/3/5/3/135303959/kekakubixosidiw.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/nukexifepejisox.pdfIn PDF document text
    • https://jixobufasov.weebly.com/uploads/1/3/4/3/134324480/wosawuxotexuv.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/temujonuwu/93687984758.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/vizinadete.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_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 5460 bytes
SHA-256: d98c880f2f9fba0108601df26d94169ab1edb93f4a67fd25e5631a792acd1da3
font_01_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 10888 bytes
SHA-256: 531d762b2ce763b281fb7b3060205a66e0940779a5791fe8c3e8781c1844288a

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