Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7980ecffbc430e…

MALICIOUS

PDF

74.2 KB Created: 2020-12-17 08:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 723640d48e5b0b9ac0237356984fc796 SHA-1: 53411995f4f50bf87a8864738fc43637fef9c688 SHA-256: 0d7980ecffbc430e765302806a71d78d056802e64176f93d0812c30cdeb8229f
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host these links. The primary intent appears to be directing users to malicious or phishing 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=the+legend+of+zelda+25th+anniversary+hyrule+historia+art+book+pdf In PDF document text
    • https://mabufome.weebly.com/uploads/1/3/4/8/134880487/53c78b905e579a.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/gezejoxirukul-fibitanuvafat-risafasisajavu-repudi.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/aa94aa7f99c.pdfIn PDF document text
    • https://worofinuwur.weebly.com/uploads/1/3/4/5/134582463/9cc5fb21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410952/normal_5f9983e5cf29b.pdfIn PDF document text
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/xamibowakilove.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/gejuwolinimitim.pdfIn PDF document text
    • https://wajegeteb.weebly.com/uploads/1/3/4/8/134896445/juxixitit_guxiwasomodim.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fesixukorupu.pdfIn PDF document text
    • https://watuwejaxor.weebly.com/uploads/1/3/4/4/134437052/634405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc51d6b5e8e827d42a92209/t/5fcdd6e4662d5e24e0c4180d/1607325419161/morij.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/76993480372.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/rimowad.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_off0000ca3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 6064 bytes
SHA-256: e9b36a18d9373097d57ec7f8a266b3819513db9feb239938d89c55eadfa9c932
font_01_sfnt_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 5924 bytes
SHA-256: 53dbad869f67e536873d3409d3b2f61aa3be25027606ce90edb15ad9cadedce8
font_02_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 11032 bytes
SHA-256: 1873005ede8ed7fe4933a1e68e9b4dcc33625e77ee06d5a64b3243a4c6a9681f

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