Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f1899ea32fb559…

MALICIOUS

PDF

77.9 KB Created: 2021-03-04 17:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 34cfbd2ef5a2c6ddb1fbe8938dedc348 SHA-1: dc1fe3a3d432fcaea440eedf1258fc2a4cd80c2e SHA-256: 66f1899ea32fb5592aa87fdb14c3c6f97293d077fa74547ba225fe98cc63ea92
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'navy reserve service records', likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/strik?utm_term=navy+reserve+service+records PDF link annotation
    • http://garderob-podolsk.ru/parazukiruicl1o.pdfIn PDF document text
    • https://gulurevipad.weebly.com/uploads/1/3/5/3/135349864/d302590782621b5.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/jaiegg0/77316968220.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/je39khe/spray_tie_dye_kit_walmart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402533/normal_5fded0cdf09bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450427/normal_600668910f566.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/bupwigy/xudukirogegemobisiki.pdfIn PDF document text
    • http://mon-cmbretagne.com/pawegimibemitolewilevilww0b.pdfIn PDF document text
    • http://cmb-societe.com/chevrolet_spark_2013_workshop_manual8hh0i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_6027c3da55357.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/whaiegd/21218580802.pdfIn PDF document text
    • https://cdn.sqhk.co/miraroki/ijhgd52/vowoxozafidopita.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/d6f1125c0a28720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5fd7c5d42148d.pdfIn PDF document text
    • https://xitozenajoxoge.weebly.com/uploads/1/3/2/6/132681812/8221396.pdfIn PDF document text
    • http://ladyso.ru/drop_by_drop_quoteznbov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4be6047-d55a-4108-bda8-0d51d5792309/control_bluetooth_speaker_volume_with_tv_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9acb2e51-1f95-4597-9039-d6d5bbf140d4/lekapurutoxizuvoxox.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/cornish_maine_restaurant_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/821c2484-f580-4d8c-a780-4e87b2f0cddf/why_is_my_cable_box_blinking_green.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/gauge_number_of_sheet_metal.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/buseradofuwawibemu.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/gemunugudukujelixiwokak.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_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 5032 bytes
SHA-256: 129e8fc2634182edbe7e2982c7888f436e495f1ffb74a12d4f6ad074b2efe105
font_01_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 11236 bytes
SHA-256: 50be141ea08eabe366a9bc3705ac370d00812031e7de378f35dfa9485301cff5