Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4d50099bea9350…

MALICIOUS

PDF

72.1 KB Created: 2021-05-22 01:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 356c4d437b2a69a6d3815c151dd1a704 SHA-1: 42d6fdec1c9844f876afe70b0a39093ed0b40be1 SHA-256: 7c4d50099bea93500c305142dcc2af28ace833c3ce839c8d2821e8574d1a7b45
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

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://nipisod.ru/strik?utm_term=aeronautical+information+publication+%2528aip%2529+enr+section+1.11 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385437/normal_604fad4f995ab.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/6974483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422627/normal_600d373c799f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_603ba9ea1e4fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446165/normal_60648b34656e1.pdfIn PDF document text
    • https://kukitame.weebly.com/uploads/1/3/1/3/131379641/faccfcc929a3.pdfIn PDF document text
    • https://waxukazo.weebly.com/uploads/1/3/1/0/131071095/rewat-nilij.pdfIn PDF document text
    • https://gogovujogizog.weebly.com/uploads/1/3/1/6/131607278/gizizofewo.pdfIn PDF document text
    • https://vutepunuvo.weebly.com/uploads/1/3/1/6/131637517/belowilowapil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366653/normal_5feb513c38dc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460466/normal_5ff201a0d2d80.pdfIn PDF document text
    • https://kunagotuj.weebly.com/uploads/1/3/0/7/130739098/xodat.pdfIn PDF document text
    • https://sokevabo.weebly.com/uploads/1/3/4/6/134665749/293959.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/ba95deca-0f6c-4dfd-90ff-b85ee10f17a0/48537098101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2984580-0026-4999-ab33-b6b5b86bb4d0/bitemiredugokowefagos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/834a8eb4-65fb-4fc2-9ab8-de92f9b7a1dc/love_story_taylor_swift_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f8a7a4-f743-4a2b-89d3-a94c1c67f45a/us_postal_service_priority_mail_express_tracking.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/aircraft_structural_design_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/fujito.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/angular_pipe_html_template.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_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 5528 bytes
SHA-256: d6eec6281383aca810f5f6e58bc861145e5274e40c77775b22fb2c194dcb1633
font_01_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 10184 bytes
SHA-256: 0586f9bb9fc4c3b9c0aaeef412f4445d245fb64fc223caefdc0b229b2089e229