Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f720f9517aeabb…

MALICIOUS

PDF

74.3 KB Created: 2021-03-25 18:57:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7bc52a8f8ae8ee59f676b6ae91da98a4 SHA-1: 5ca1e25697076ca56b3f5cf215ffdbba37691e6f SHA-256: f3f720f9517aeabbb7181f3ce98e70a949048fdb349228043a83756ec369b093
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=chapter+2+functions+equations+and+graphs+answer+key PDF link annotation
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/tosidedigesedo.pdfIn PDF document text
    • https://sujozomamuv.weebly.com/uploads/1/3/2/6/132681492/1199785.pdfIn PDF document text
    • http://xixubinetigos.iblogger.org/future_simple_exercises_perfect_english_grammar.pdfIn PDF document text
    • http://show-visitor.xyz/pixaneguveguxepekif1tcx.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/6053980.pdfIn PDF document text
    • http://presentinsta.site/halloween_fake_nails_amazon2mstv.pdfIn PDF document text
    • https://rebeluzibefu.weebly.com/uploads/1/3/4/6/134619862/2008c9f4.pdfIn PDF document text
    • https://modefijibig.weebly.com/uploads/1/3/6/0/136011483/sifafirom.pdfIn PDF document text
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/0966802c55.pdfIn PDF document text
    • http://vanlit.ru/arifureta_light_novel_volume_7ts632.pdfIn PDF document text
    • http://fasadi.site/vudagewujamugx9tt.pdfIn PDF document text
    • http://216tilford.com/18563030946rzd1o.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/bd1a11b6fe399b.pdfIn PDF document text
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/wexemarateda.pdfIn PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/6d1e381.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaterojot.epizy.com/metodologia_de_la_investigacion_cuantitativa_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/biology_class_12.pdfIn PDF document text
    • http://rudemunipa.epizy.com/xobijedatezuvukoxexowu.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/nokia_android_phones_amazon.pdfIn PDF document text
    • http://rafopaju.rf.gd/android_emulator_for_mac_high_sierra.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC2 5804 bytes
SHA-256: 717a9a995fac866dd68434bb619cb7b8bdac8b93339ec479c9c6af5a30689520
font_01_sfnt_off0000df91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 10704 bytes
SHA-256: dd81995ba4648ab9157a74e324e72ee6ce645fcb2710dc353433b707cd1b8b30
font_02_sfnt_off0001048b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 16112 bytes
SHA-256: 366b2a3ed9b44e620159a8175e6f9935b0189d17b94b4d5ccfd5980b0b155f3e