Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5a2e3d41a3962c…

MALICIOUS

PDF

90.4 KB Created: 2021-03-29 23:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e23e41fd4c85e09b06fb542cf9f1f4b7 SHA-1: 48e5bca2600abc2f639a099636295e3880a198d7 SHA-256: 5a5a2e3d41a3962c864d4be0ee7289ed417fb9c223c2d0f58ac9389d7ed1c1ce
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 0.9997

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://jumiwimov.ru/award?keyword=types+of+carpentry+tools+pdf PDF link annotation
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/7017867.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/6145441.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a2d8c05b-35fd-4900-a38b-056cc5a53034/how_to_host_at_a_restaurant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8f8e9c-542b-441a-b5e0-bb2cfdf5a9ff/is_maggianos_open_for_inside_dining.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a8b14fa-34f6-48ce-87b5-c2e3032a18f8/felopujoxad.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/how_to_view_notes_in_powerpoint_while_presenting_with_one_monitor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d8b767-52a7-4d6d-87e8-4d01dc8b25aa/radio_shack_wireless_infrared_headphones_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/24404599633.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_35c69a82eb40478fba462c0717223fec.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_8b0f21a26e5c4094b06aa87053793b2a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce4e7076-f467-4f20-a9d1-a797bbe52d0a/air_force_academy_colorado_weather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46b009f-5d7c-4b3c-ad64-a110d9cdb5c5/toro_electric_snow_blower_problems.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_7b646541811b49e1adc69256a1d740b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/8872287621.pdfIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_4dc20060098f48be92ac98f918944a4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e96386-1766-4181-9b76-8cb59db9f861/4866311550.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_9549584936fe46bea8a236d439416b84.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 4940 bytes
SHA-256: e00e812d763495cfe97ed6d47b2e39890904eabf7c136bc81323bca12b179d65
font_01_sfnt_off000127ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127ED 11284 bytes
SHA-256: 10ca2aa1e50584412484f0f27a99deb32a405da8b28e6ebec971d5ffc56b75cf
font_02_sfnt_off00014e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E55 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f