Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1b4c91774843cb…

MALICIOUS

PDF

104.0 KB Created: 2021-04-10 02:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ca6a864f32d44c6332f6561d0beca16f SHA-1: 863590354c817ffb8809a17f19a5471f4892cc34 SHA-256: 1c1b4c91774843cbd33b74dd26359c01b7c9bbff13a61826c9d0b6910cada08c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://fokemale.ru/strik?utm_term=1984+book+1+chapter+8+questions PDF link annotation
    • http://wssummer.space/linksys_rvs4000_factory_resetswdcp.pdfIn PDF document text
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/5e75e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383924/normal_5ffd54cc511b2.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/gokuxupolofufi.pdfIn PDF document text
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/muwobizubotoxil.pdfIn PDF document text
    • https://kumakisatosoref.weebly.com/uploads/1/3/5/3/135328720/9148094.pdfIn PDF document text
    • https://gusumumonabol.weebly.com/uploads/1/3/0/7/130775475/8385720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_5fda91feb41c8.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/6998991425766ucf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423427/normal_604e05ed1f346.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460241/normal_6003254e666cf.pdfIn PDF document text
    • https://voloxamofe.weebly.com/uploads/1/3/0/8/130874475/8e4fe359fb.pdfIn PDF document text
    • http://esparks.ru/71853554438ry0gd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5fed3a208c11d.pdfIn PDF document text
    • http://teaapple.space/one_touch_ultra_test_strips_reviews6ifa0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_76f94af603374a01bd02ab81bd4ea7b7.pdf?index=trueIn PDF document text
    • https://b0b8c8c5-0de0-49ea-8337-0a56b8a4e65f.filesusr.com/ugd/bf9dfc_e54dad75f5f94b1d899361ae1009cb04.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_26c3bc08f95341cc961c38456f340bb9.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_499794cbd586499bbfc65a8817628206.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF0 5716 bytes
SHA-256: 3e1b32fd758fad3ed3fa97ba2e10b7ffdf1ef3c6349e91bab92bdf2b6aac92a8
font_01_sfnt_off00016f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F65 10352 bytes
SHA-256: 151e23f8deb196cffefd5f5d1586c715635c96045db363d69b0f155691c80f2f

Open this report in the interactive analyzer, or submit your own file for analysis.