Malicious PDF — malware analysis report

Static analysis result for SHA-256 c986cc35be8a1fdc…

MALICIOUS

PDF

77.5 KB Created: 2021-06-05 13:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5a55621e2909c3934d62c585bf3e5127 SHA-1: 510c7a46d8f51e89562446b754e146b021f60626 SHA-256: c986cc35be8a1fdc417e6f3750de32c1b2f5ded7cbf08875b18e86212b871b3e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains text related to a "waste king reset button", likely a lure to encourage clicks on the embedded URLs.

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://krisoc.ru/pbw?utm_term=waste+king+reset+button PDF link annotation
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/pawesonexulu.pdfIn PDF document text
    • https://dadizatutelebi.weebly.com/uploads/1/3/1/0/131070904/vowunazexokaz.pdfIn PDF document text
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/5123887.pdfIn PDF document text
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/9842022.pdfIn PDF document text
    • https://geselumagema.weebly.com/uploads/1/3/4/6/134695037/jaralolufem_fidujitenisapub_mojus_fejofok.pdfIn PDF document text
    • https://ruwefenoref.weebly.com/uploads/1/3/0/7/130739117/9234915.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453901/normal_5fdfb5d3bde4d.pdfIn PDF document text
    • https://sexaxekeka.weebly.com/uploads/1/3/5/3/135313825/4627039.pdfIn PDF document text
    • https://liragajukum.weebly.com/uploads/1/3/7/5/137513179/wanodazavaxivek_pomajiwa.pdfIn PDF document text
    • https://jozegolufipiz.weebly.com/uploads/1/3/0/7/130776065/nilonamatagabuxemuj.pdfIn PDF document text
    • https://wubobuxidozexe.weebly.com/uploads/1/3/4/3/134322977/1446782.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413118/normal_5fefb4b7b67a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474979/normal_5fe8073ce1ca6.pdfIn PDF document text
    • https://wotuvinuvokotar.weebly.com/uploads/1/3/5/3/135330473/3924369.pdfIn PDF document text
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/8361094.pdfIn PDF document text
    • https://sosawurezere.weebly.com/uploads/1/3/4/6/134670534/5868315.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/022418ef-f361-4c22-8e1a-c3bab1d9d5ff/tabitumelamuzeramuvibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b8c7c2-58e2-4e56-9ffe-f8f1d905963b/janavovigigutopogegi.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_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 4920 bytes
SHA-256: 249e7072cbedad255e730928482fa60fd40812fa3d70f006135538bc4acb9fed
font_01_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 10196 bytes
SHA-256: 4397ed0f485369446cb56e6c8c5af5c811501efa5eff1e21808ad58388f752ba
font_02_sfnt_off00011a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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