Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5b00d3c0b33810…

MALICIOUS

PDF

77.7 KB Created: 2021-06-06 23:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bc5c9af37b09ad623cdb463f91af7828 SHA-1: 249725675dad4dc9af12f018286ddb2690098797 SHA-256: aa5b00d3c0b338100f2ebb1f90a7e5ec187c8604f5e52fa03faca871d954e1b6
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or SEO spam campaign. It contains a large number of external links, many pointing to disposable hosting services, designed to redirect users to potentially malicious content. The document body is heavily obfuscated and appears to be junk data, further suggesting a malicious intent rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/pbw?utm_term=mortimer+adler+how+to+speak+how+to+listen PDF link annotation
    • https://gilasagajeradek.weebly.com/uploads/1/3/4/6/134632792/0f20ebaa8ddb9.pdfIn PDF document text
    • https://sadavofabuloxus.weebly.com/uploads/1/3/5/3/135316226/439e2.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/44eee0.pdfIn PDF document text
    • https://semazuxogevagox.weebly.com/uploads/1/3/4/0/134017751/15d102a6d1a7eff.pdfIn PDF document text
    • https://sujujiga.weebly.com/uploads/1/3/1/3/131379538/jivogesuvi_daroji.pdfIn PDF document text
    • https://xaxazusilu.weebly.com/uploads/1/3/4/7/134757455/09759064773.pdfIn PDF document text
    • https://vajemedodumuni.weebly.com/uploads/1/3/4/3/134351385/19f035758e876.pdfIn PDF document text
    • https://jobexevufurol.weebly.com/uploads/1/3/4/5/134526996/7494221.pdfIn PDF document text
    • https://lemevepavakupe.weebly.com/uploads/1/3/4/7/134701524/vugusilug_kuwusuzegeso_bekesepuju_divijipunoruju.pdfIn PDF document text
    • https://zotabuja.weebly.com/uploads/1/3/4/5/134510490/wabevororiraz.pdfIn PDF document text
    • https://daxodewime.weebly.com/uploads/1/3/1/3/131398188/3186489.pdfIn PDF document text
    • https://fubotuvexar.weebly.com/uploads/1/3/3/9/133997611/4497885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zeladejan.pbworks.com/w/file/fetch/144656502/how_to_pair_xfinity_remote_to_tv_box.pdfIn PDF document text
    • http://tarogifere.pbworks.com/f/cisco_air-lap1142n-e-k9_eol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ed67ce-3134-43f4-84d5-3079e76d2a79/kudozifojarobu.pdfIn PDF document text
    • http://kegogaxevu.pbworks.com/w/file/fetch/144659991/120_film_full_indir.pdfIn PDF document text
    • http://pevozowo.pbworks.com/w/file/fetch/144427632/xagikidokajesakute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eaa13da-0fdb-448a-9d56-9161e1366a59/45087699425.pdfIn PDF document text
    • http://zuvuwiro.pbworks.com/f/bazizikekugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a918900-bffa-4788-8df2-4ec8abd8bc85/how_to_be_a_sniper_in_the_royal_marines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a468461-49d4-403d-971a-f788d284c628/kogoxugomemonafozopegejon.pdfIn PDF document text
    • http://kuxuraroj.pbworks.com/w/file/fetch/144677898/the_theory_of_moral_sentiments_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42d1318-04ff-4721-ad62-de0c3b071c39/sagatoravoxoradunij.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/zuworajupakef.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_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 5360 bytes
SHA-256: 9a438694d3235fe34e1b89ed1a16978228c5a36fbaefcd362f4a24d0ff582a10
font_01_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 10792 bytes
SHA-256: 968905b8fa060c6afee11ecd5c64b24c9b433f1a5f9e7ae10f4b00bd9ca50340