Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9feff2739dc2a5c…

MALICIOUS

PDF

99.4 KB Created: 2020-11-24 15:49:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d1ea7ca0958a9474db17b804c4a67fdc SHA-1: 04552ac5a4c9209f52dd4e1553bf9f0eaa119412 SHA-256: b9feff2739dc2a5cbbe414385f4554f66003c1db511ed0b8e807e4dfb3eb9ae2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs point to various PDF files, likely intended to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?utm_term=avengers+earth%2527s+mightiest+heroes+wasp+transformation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380858/normal_5fbc3d31bddb9.pdfIn PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/ef3e31983a1.pdfIn PDF document text
    • https://pebusopewege.weebly.com/uploads/1/3/4/7/134752512/8b122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_5fad696c9ea51.pdfIn PDF document text
    • https://sutikarojujo.weebly.com/uploads/1/3/4/3/134343437/pasaneba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_5fa2446748d92.pdfIn PDF document text
    • https://ropababiw.weebly.com/uploads/1/3/4/6/134667017/tiwokeros.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/8ab4a8bc.pdfIn PDF document text
    • https://lefoxidegej.weebly.com/uploads/1/3/4/5/134526886/f37244c57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497110/normal_5faba9e92e44f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490950/normal_5fbadf1d32c46.pdfIn PDF document text
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/xolubelozo_polezewurujewab_temivozox_dijada.pdfIn PDF document text
    • https://visobugogo.weebly.com/uploads/1/3/4/5/134582963/25045.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/divexikav/the_backyardigans_tasha_shoes.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/baby_love_songs_youtube.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_off00014841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14841 5456 bytes
SHA-256: dc0de5800ee9a598350baa01938466ba4729df4575b1fdc8fd30f5d4dda7a235
font_01_sfnt_off00015ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ACE 10876 bytes
SHA-256: 306e80e2989bc59c216470a1050a223c09e6ac94a94357104fb50162d6ab990f

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