Malicious PDF — malware analysis report

Static analysis result for SHA-256 c888630f81a9d090…

MALICIOUS

PDF

67.2 KB Created: 2020-11-25 17:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 73d72197a2ea9de479d9099b274377f3 SHA-1: 1dc08cce36bc12097ea51c576795035c0f89f02d SHA-256: c888630f81a9d0903044bd71642e6e1daaea990d6f597a86182bb905d140d51c
246 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a mass of external links, many hosted on disposable domains, and specifically impersonates 'Norton' to lure users to click on a redirector URL. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO spam or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/9427711.pdf.
  • 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://traffset.ru/123?utm_term=multiplication+rule+probability+problems PDF link annotation
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/9427711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_5fb2581f856e1.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/6205182.pdfIn PDF document text
    • https://sofugiri.weebly.com/uploads/1/3/4/5/134509821/552015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389352/normal_5fbd012e8073e.pdfIn PDF document text
    • https://zegokovoni.weebly.com/uploads/1/3/4/3/134323662/votufulojukodog_dadunumu_sakogirowez.pdfIn PDF document text
    • https://manoxumumaxu.weebly.com/uploads/1/3/4/4/134472756/kipape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458623/normal_5fad776644538.pdfIn PDF document text
    • https://nimizinimaji.weebly.com/uploads/1/3/4/7/134703428/pudula-sikoxusirifog-jixaregobiwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_5fa37f13f11ca.pdfIn PDF document text
    • https://pexikonafan.weebly.com/uploads/1/3/4/3/134351575/savuzof_lekofanokitakit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/simujix/85023074274.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/munojopamigudixebuvafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2aefde8-b15f-4b69-ad7b-b4181b44857f/into_the_wild_activity_12_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cbbba6f-66e0-44d2-a7d8-ec4de2efd0f6/waxunizokogobekuweb.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_off0000c7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 5324 bytes
SHA-256: a9762c3dda603627a255bb2ac89750591c2bef6a73d10965155aa737acedfe40
font_01_sfnt_off0000d9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 10996 bytes
SHA-256: 35934cd9877637fe11dc09def57842534645c48673947dcdddb40e0e9614950a

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