Malicious PDF — malware analysis report

Static analysis result for SHA-256 baed193b109435e5…

MALICIOUS

PDF

76.3 KB Created: 2021-03-14 05:24:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b5ef9016f78b3801f895ddbfad56c724 SHA-1: 89fc7db8824c5a42475d616575e9cd532b34adae SHA-256: baed193b109435e5a4c132ec776c6cf57a6a8928a1788046e65baaed92023753
186 Risk Score

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 0.9995

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://crophysi.ru/wix?keyword=latest+zygor+guide+free+download PDF link annotation
    • https://sosepokapebovi.weebly.com/uploads/1/3/0/8/130814645/fulovojikabor-vojoligi-tikamufoneme-tapapawe.pdfIn PDF document text
    • https://xowogibudul.weebly.com/uploads/1/3/4/4/134446034/2873761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_6026c1f5792a9.pdfIn PDF document text
    • https://betixajivuf.weebly.com/uploads/1/3/4/9/134900014/zavek-terisano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494149/normal_60145b2198c77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_6006fedecb4f2.pdfIn PDF document text
    • https://pusosisuko.weebly.com/uploads/1/3/6/0/136094517/zorikugawunused_ninedigexuba.pdfIn PDF document text
    • https://lexabefi.weebly.com/uploads/1/3/1/3/131384613/5814775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414514/normal_6000cebd9734c.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/nitajosasa/60307984737.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/67666028534.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/arjun_reddy_movie_telugu_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b906b7-4d78-4fef-be47-995bc6df9b2a/vawupenosexarune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7f6de4-6048-4a0d-81b8-24f7f158cb7d/loruxidojukiwovas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5c9486-d473-4077-aa85-6c187a44a1bb/5958098558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d68197f1-6854-4bcb-866f-aca9dbc1b35b/biboxoj.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/outlook_android_app_calendar_attachments.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac01259-9891-4e87-9f71-dd2a5fedf1b5/64198695543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1eb4e9-4c47-4134-a9dc-512cdac8588e/72566418748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c816ba08-42f1-4c6a-8e81-6ee0b0bb76d1/kosaketodiduzu.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/dinunofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159381ae-5b13-4e41-ad07-6c031906b552/likuwifijukoba.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_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 5140 bytes
SHA-256: 833c53dd5695cc6063eaff2fdd2fc0e07473c234ea05e3fd349f0e503f2ad9ed
font_01_sfnt_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 10180 bytes
SHA-256: b3933aa13b8786f9e862b85fda28cf9d884d553214b270727041959d74df8b33
font_02_sfnt_off000115d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3