Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa763a047847456…

MALICIOUS

PDF

67.5 KB Created: 2020-11-10 03:59:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8b505cfb4c46a9b50572076ddfa64453 SHA-1: 32d107727875968440a95b347d2ae612f6c414fd SHA-256: 3aa763a047847456006f4b1817ca0df6b8a68be1f2b7cb4dd82ad05cd8374f7d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to other sites. One prominent URL is 'https://traffnew.ru/strik?keyword=hill+climb+racing+2+mod+apk+hacked+parts', which appears to be a lure for potentially unwanted software. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution attempt.

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://traffnew.ru/strik?keyword=hill+climb+racing+2+mod+apk+hacked+parts PDF link annotation
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/ratexa-jatel-joroxi.pdfIn PDF document text
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/zananadag_momazeji_zosud_raxejagemedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388282/normal_5f9e5d6fb5872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_5fa857b5355b3.pdfIn PDF document text
    • https://josugonu.weebly.com/uploads/1/3/4/4/134488469/bukolon.pdfIn PDF document text
    • https://sidonakitipu.weebly.com/uploads/1/3/4/6/134631457/cf377f4968a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5fa00dcccc7e8.pdfIn PDF document text
    • https://fizokufewof.weebly.com/uploads/1/3/4/0/134096090/57986f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412160/normal_5f9913ae94df9.pdfIn PDF document text
    • https://gidexexururetus.weebly.com/uploads/1/3/4/5/134505918/pufawul-punedobunodotum.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/sirasu/blank_thermometer_goal_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/69518794818.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_off0000c900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC900 5784 bytes
SHA-256: 750caad385ab12fd333eeaba32ae4cd78a8daa8e15d231c0603b101ac610900b
font_01_sfnt_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 10796 bytes
SHA-256: 67f97e93ffd46575608bbf1e4554039ba899fb46d3f96b044f9d4845ec045d4f

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