Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad4485f1c96acd5…

MALICIOUS

PDF

85.7 KB Created: 2021-03-10 13:47:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7bfcbcc3d6d288b67408dfa7cd416ca7 SHA-1: 4ccd11fa7891b3feda7464d43ce5304b4de9da06 SHA-256: 3ad4485f1c96acd512f9388796e82d899c5cab3a09c05e8cedc122710e468531
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The primary embedded URI, 'https://baarspo.ru/award?keyword=escabiosis+tratamiento+permetrina+pdf', indicates a potential phishing lure related to medical treatments. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely for distributing further malware or conducting phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/award?keyword=escabiosis+tratamiento+permetrina+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484635/normal_5fd30515b59fc.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/ab38a87afa59b8.pdfIn PDF document text
    • https://rusolozotiwar.weebly.com/uploads/1/3/5/9/135992237/6588995.pdfIn PDF document text
    • https://burobedulaku.weebly.com/uploads/1/3/5/2/135299914/begususijusidetal.pdfIn PDF document text
    • https://vunisanege.weebly.com/uploads/1/3/0/8/130813420/sopiputajiseze.pdfIn PDF document text
    • https://xeneniwavufew.weebly.com/uploads/1/3/2/8/132814439/2826332.pdfIn PDF document text
    • http://wojurimaxab.mywebcommunity.org/wezemasepoz.pdfIn PDF document text
    • https://fomofasagulak.weebly.com/uploads/1/3/4/8/134860280/fabonivadexunasefeg.pdfIn PDF document text
    • https://dirasikazeta.weebly.com/uploads/1/3/1/3/131379856/xanula_nomekabikowopal_faridagav_mifofete.pdfIn PDF document text
    • http://rapoxarawiwalo.sportsontheweb.net/difference_between_pneumonia_and_bronchitis.pdfIn PDF document text
    • http://femetorisufi.sportsontheweb.net/lovixuruvasewafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_600b78490e6cf.pdfIn PDF document text
    • http://wusodopepufex.66ghz.com/royal_commission_into_deaths_in_custody_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5feaf7246359b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://totawog.epizy.com/lovexaxe.pdfIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_46c803de08914a368e6b72d47f0fc9ef.pdf?index=trueIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_6db8a6247f41427ea6ebd7684482e0bb.pdf?index=trueIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_7e003308c31747bfb996a2060c6d2e79.pdf?index=trueIn PDF document text
    • http://wazuvolixevafo.rf.gd/self_actuated_pressure_control_valve.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_cea652520ef34fceb2584fce3af14fd3.pdf?index=trueIn PDF document text
    • http://kowewewabozete.epizy.com/bernward_koch_piano_sheet_music.pdfIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_ba9e56b382904e6f9c697bfe8de7f3e3.pdf?index=trueIn PDF document text
    • http://junusesofuxog.rf.gd/mary_poppins_jr_script_free_online.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_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 5364 bytes
SHA-256: 4ff9f7925b280c5ff8937200c0f07319b79fc1cfde39abe35c2a65e6cc253a39
font_01_sfnt_off00012354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12354 11224 bytes
SHA-256: bcbccf90bc6b627966c043b025996f712aacfd818578133168e8590979160c2a