Malicious PDF — malware analysis report

Static analysis result for SHA-256 a855534e52fea172…

MALICIOUS

PDF

64.9 KB Created: 2021-03-03 17:39:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ff1b00278eb21a9b6f1d72352932d86e SHA-1: 2bd838deb2706b50dee0444d7cad046f252469d2 SHA-256: a855534e52fea17293ca409cd872fcb043e6519cd46b2ba07685d4660567af33
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://ponafet.ru/wix?keyword=find+the+missing+length+indicated+worksheet PDF link annotation
    • https://cdn.sqhk.co/wifukatar/iHw0jgD/descent_road_to_legend_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/9Pep3jb/b_section_taper_lock_pulley.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/nkxtgc0/55893455168.pdfIn PDF document text
    • http://natgood.space/15529173321h89p0.pdfIn PDF document text
    • https://cdn.sqhk.co/sofawaju/jceihif/12553852926.pdfIn PDF document text
    • https://poxuroli.weebly.com/uploads/1/3/0/7/130738943/fajudumegurogesijaza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459057/normal_5ffc71920c96a.pdfIn PDF document text
    • http://shopsupergood.site/nordictrack_1500_commercial_treadmill_disassemblyca79b.pdfIn PDF document text
    • http://biomaniix.website/73642221961wef4p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_60202e4656b09.pdfIn PDF document text
    • http://uniques.space/autobus_marbella_malaga_aeropuerto2ecz4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412568/normal_5ff813e3b94f6.pdfIn PDF document text
    • https://gejowarog.weebly.com/uploads/1/3/2/7/132740172/nevewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_601213b015342.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/ahggehc/mejemib.pdfIn PDF document text
    • http://my-credit.info/balemuzukajanupe4wuo.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/jaciajg/download_custom_cast_mod.pdfIn PDF document text
    • http://groshyk.site/pererizejufakedx3kul.pdfIn PDF document text
    • http://moitender.org/cloudformation_template_yaml_to_json93iam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39A 5464 bytes
SHA-256: 4a34ffd0504a09d828ee27a2892378fe3ebad145a1a878da966266b0acb76dc1
font_01_sfnt_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 9468 bytes
SHA-256: 6a468e022a3f017d0088f6e162ee7dcef476ba5b6d784957c3ce9892e2c4d3f9

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