Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec4dae39bf99397…

MALICIOUS

PDF

96.0 KB Created: 2021-05-29 22:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 301b0fcc1606cd9d6746eb1e7a94c073 SHA-1: ac4ccda96c5ff0fd9251ae776353f44d3ee66c24 SHA-256: 7ec4dae39bf993977d47d16afd2d1993c8897aabc2058cf28b1d24369ba36189
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=how+to+explain+zodiac+signs+to+a+child PDF link annotation
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/1083311.pdfIn PDF document text
    • https://jikizukudelo.weebly.com/uploads/1/3/4/8/134879768/fuburuxovube_pomomuwede.pdfIn PDF document text
    • https://pigudoxuwupif.weebly.com/uploads/1/3/1/4/131437670/dezonabafukugu_laweve_kumeru_nigimig.pdfIn PDF document text
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/mexotafobefudi.pdfIn PDF document text
    • https://wetugaremuzen.weebly.com/uploads/1/3/5/2/135298520/molezimojer-remir.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/risunave_zopibisupegasox.pdfIn PDF document text
    • https://nawomabikovuz.weebly.com/uploads/1/3/4/7/134730946/kabobalexuvukan-tusazeteg-pixolap-kigexugiziri.pdfIn PDF document text
    • https://rilopogikumifo.weebly.com/uploads/1/3/4/3/134320310/kurejadewinaxatijodo.pdfIn PDF document text
    • https://biwoponafi.weebly.com/uploads/1/3/4/7/134767969/nojugunefalefole.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/edcd4e2b-31ed-493a-9a6a-cc3819a24680/bexetaxijuvepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e958a89-5bbe-44ee-bd0a-a620b4aa6546/40361049373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1efb9df-4477-4cd7-9a90-34bf23f48d87/bafijifujopasitox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb4ccbb-6b05-411d-8f14-930893c1baef/mass_flow_rate_formula_for_air.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7b47ee-0127-4996-9666-288db822411c/does_walmart_sell_dehumidifiers_in_store.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ed8b87-2bb1-4a7a-925d-484bdb1c72f0/text_your_ex_back_michael_fiore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db97b4a3-1413-43c8-8fe2-d0807195d1fb/rounding_numbers_worksheets_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/535a004f-aa7e-43c9-aa52-dd5f2d7494ff/91104226254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6b4d1c-82ec-446d-8a0f-ab3739bebc16/26660076388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22c7231c-7d37-4f40-b431-450c31537bb6/2013_maserati_granturismo_mc_stradale_specs.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_off00013a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A56 5408 bytes
SHA-256: f9af222f3bf13a0ab2f6cd896fa3146e2646d54d01e7ed52f959745a565c195c
font_01_sfnt_off00014cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDA 10708 bytes
SHA-256: f7fbf52943127d3eea67bec68021a22b5dfcab195bbd7a6e99ad1af8a9a715a9