Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3618eaf81eb3ba…

MALICIOUS

PDF

76.2 KB Created: 2021-02-19 01:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5cc7f9e068068d1365b76dd8f2d3c6e9 SHA-1: b5eb34fa0b4fdb78dc542c51abccb9cf1526b2c9 SHA-256: bd3618eaf81eb3baacd0b144c009f96816ab82405122824364cefe4a4c5360cf
126 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains or subdomains. The document's content appears to be a lure, using a search query for 'kerosene heaters for sale on ebay' to entice clicks. The ML classifier strongly indicates maliciousness, and the extensive use of external links suggests an attempt to drive traffic to potentially malicious or scam-related sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://seumenha.ru/123?utm_term=kerosene+heaters+for+sale+on+ebay PDF link annotation
    • https://cdn.sqhk.co/vemudumuxixu/ijohbgi/ponikizavokusasogolobisu.pdfIn PDF document text
    • http://frankkyko.com/napevofupebefemivakarajox49w.pdfIn PDF document text
    • https://cdn.sqhk.co/gitaligido/ieih22v/xisarus.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/pezivusowumew.pdfIn PDF document text
    • https://cdn.sqhk.co/gafokoru/Ckljdhg/zuvizamuditalebiso.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/a9b62ec4245.pdfIn PDF document text
    • http://stickerrus.ru/hooks_bell_1992._black_looks_race_and_representationt0yiu.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/JijjipF/business_calendar_2019_calculator.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/lokunokelaso.pdfIn PDF document text
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/zavadusadivirepi.pdfIn PDF document text
    • http://gratoraama.website/mhw_insect_glaive_advanced_guideoj0pt.pdfIn PDF document text
    • https://cdn.sqhk.co/madosodu/b4IRPjg/76501425322.pdfIn PDF document text
    • http://zeropium.com/538872060519q2h9.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/0ZRgixK/spacex_starship_interior_design.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/hcgjoha/80549728951.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuguwusilabibax.epizy.com/24092721611.pdfIn PDF document text
    • http://rijimilaje.rf.gd/75620621820.pdfIn PDF document text
    • http://bobiwusej.rf.gd/jetefigupo.pdfIn PDF document text
    • http://wowimiberosodav.epizy.com/goodbyes_post_malone_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/zapfino_arabic_bold_font_free.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_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 5068 bytes
SHA-256: 4e68a194af481fb2825ea8b64093d0d5fef2348ca0cbf7dc546be4d83042d700
font_01_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 10964 bytes
SHA-256: e1a940028f0950d1d5a67109c5c88c414e3830231f9c00d9c3837dfedf94587f

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