Malicious PDF — malware analysis report

Static analysis result for SHA-256 778954802932979d…

MALICIOUS

PDF

71.9 KB Created: 2020-11-25 01:00:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7c73cef7c31c5fb35025a50885694c0b SHA-1: 176de8ca53420b9d00812efad85ad9b80fcdc383 SHA-256: 778954802932979d9bf1486ab9b665d495f339f57b730636fa8eafe0f28d8998
244 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed for SEO manipulation or redirecting to malicious content. The presence of a link to a known malicious redirector (traffking.ru) and the ML classifier's high confidence score indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Texas adjuster license study guide'.

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://traffking.ru/aws?utm_term=texas+adjuster+license+study+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f8d84b55843d.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/3def0.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/verexe.pdfIn PDF document text
    • https://gekubunog.weebly.com/uploads/1/3/4/2/134235395/boforajomeja.pdfIn PDF document text
    • https://nulunofelixor.weebly.com/uploads/1/3/4/6/134646046/e2cdea5309.pdfIn PDF document text
    • https://gozuvixonoj.weebly.com/uploads/1/3/4/5/134517501/sotemekedakalogoma.pdfIn PDF document text
    • https://sodumixiseto.weebly.com/uploads/1/3/4/3/134311801/xazobiwizinedojedug.pdfIn PDF document text
    • https://boxavukexuzar.weebly.com/uploads/1/3/0/7/130775797/tuwuzibifonona.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/6192605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f88b450157f5.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/pivetuzadujo/google_sites_create_website.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/95016664187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b242acfd-3934-4841-821a-78f74d9e8bfc/22311716626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/472f4d8c-5358-483a-a7c5-82d1cf583a68/chromatin_chromatid_and_chromosomes_related_to_each_other.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_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 5304 bytes
SHA-256: 9e5e6c9aa22317ae2c3e01eb94808dd89edc766cd06c6340e4c10e06b77a2d4b
font_01_sfnt_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 10836 bytes
SHA-256: cb5fc0529a28ed260c2c5eb9c500e890a90ac845403ba0913c378595d8a8aefe