Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4706bfc0fdb01d…

MALICIOUS

PDF

67.5 KB Created: 2021-01-26 22:56:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 257aeedd1eaa5646758faf5cf09c7a54 SHA-1: 3b8719dc964e041bdf08212c21efc473ab492139 SHA-256: 0e4706bfc0fdb01d854d30513b9e360272cd7301a3db7c2532261b5cbeae857b
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. One critical heuristic indicates a direct link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=la+crosse+radio+clock+manual In PDF document text
    • http://buyfastedcircle.xyz/kixilijaxakapekagebodewib17bvg.pdfIn PDF document text
    • https://cdn.sqhk.co/kiledone/njaPhcp/12958718912.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/fwiha69/68113702477.pdfIn PDF document text
    • http://easy-money-cash.space/javadidatolobijetabexapalnjvfr.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/nWWiaij/spike_jones_city_slickers_youtube.pdfIn PDF document text
    • http://coolvdomaion.online/wodowevr8vaq.pdfIn PDF document text
    • http://info-pages.ru/71105741369ghqhc.pdfIn PDF document text
    • https://cdn.sqhk.co/fekesolip/1iejdgd/20517916231.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/dibibidezotaguf.pdfIn PDF document text
    • http://yblda.fun/guxevopumopolp3lmh.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/kezemiradigu/33579501700.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/current_weather_report_in_trichy.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/eu_supply_plc_annual_report.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_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 5092 bytes
SHA-256: 5f62d1d4d7799de855658558dcfc25f972dde2ed36d4d11d757872f345901ee8
font_01_sfnt_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 10204 bytes
SHA-256: bf43798977019de47018b1ee363182e1b4f2cfba77511b8744c90c800c52e9b3

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