Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcbf6b2ffec29d5…

MALICIOUS

PDF

71.5 KB Created: 2020-11-14 01:36:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d871d4e88dc0dd9bd0bf872f43b2b892 SHA-1: de141989185408e3beabf0649c74295650f3098b SHA-256: 1bcbf6b2ffec29d524da5ce6c753e9b0e69f93e4a3024131ea9934e76c8534c7
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links to external websites, including a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'reading comprehension'. The presence of a link farm on disposable hosting indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gettraff.ru/strik?utm_term=reading+comprehension+past+simple In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403823/normal_5fa643c515274.pdfIn PDF document text
    • https://paxudusumumo.weebly.com/uploads/1/3/4/3/134312151/f0d262fb457f.pdfIn PDF document text
    • https://kuwugexikoxol.weebly.com/uploads/1/3/4/7/134718068/3c9255.pdfIn PDF document text
    • https://vepezifu.weebly.com/uploads/1/3/4/2/134265798/1dbae67a0.pdfIn PDF document text
    • https://bujufanabatoxiv.weebly.com/uploads/1/3/4/5/134598972/7010417.pdfIn PDF document text
    • https://livabawixegi.weebly.com/uploads/1/3/4/3/134320323/winupagaza.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/6943510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_5f94734070768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378165/normal_5f94bd2191828.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://s3.amazonaws.com/gaxuremewuger/losagikud.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/80788368249.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_off0000ce58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE58 5284 bytes
SHA-256: ddcfccc8ba90cc0c9623c825e717d9f350437f3f3389db4564fdf9922161c5bd
font_01_sfnt_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 10268 bytes
SHA-256: 411c79412daa22e5de66c14dd4480ebd072bb126b25befdb8a6db0606d4b585c
font_02_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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