Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21425ef248ac750…

MALICIOUS

PDF

79.1 KB Created: 2021-03-25 00:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 6f943e4a3e3ee0b4a823a9849a0c84b7 SHA-1: 94373654e2bd0923ed7640c813ebde914893a7f8 SHA-256: b21425ef248ac7502227d2955562bdda74c94f3fffe996ed52e08167c7bd7403
134 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with one pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'Harrisons manual of medicine 18th edition', likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/strik?utm_term=harrisons+manual+of+medicine+18th+edition PDF link annotation
    • http://loxupuf.mygamesonline.org/93377519560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450244/normal_605959a96fa41.pdfIn PDF document text
    • http://zikemipirelojo.22web.org/59756774310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422150/normal_605592fa099a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_601f793748d68.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/zatolajixisixusexigefis.pdfIn PDF document text
    • http://mozujana.22web.org/dendrobium_orchid_care.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401694/normal_5fdad93a2c9f3.pdfIn PDF document text
    • http://libebilefopa.iblogger.org/61402914726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_6014606f47610.pdfIn PDF document text
    • http://jipolavex.medianewsonline.com/22436107732.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
    • http://misanedajog.myartsonline.com/36581610365.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/is_beautiful_creatures_book_appropriate_for_11_year_olds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54b7ae1b-7d2b-4f27-8a8b-55bb759d4cbd/using_information_technology_11th_edition_free_download.pdfIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_e6ec207cab99424ba8b79db0d479eca8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d222eb7d-a673-4911-a574-ee4c60e9a11e/evod_vape_pen_charging_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a05422c7-40d4-40cf-9a03-a110df870215/muzolikavugegupenatuvutes.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/brain_and_behavior_a_cognitive_neuroscience_perspective_download.pdfIn PDF document text
    • http://zakagoxufi.epizy.com/cricket_bat_size_guide_cm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0628e554-dbd3-4ca3-88e5-72eafbad4c88/semavopurit.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_689bc94ac5d8449796e2c88087a56503.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b487ffda-d99b-4e12-8bbd-96ad5f89d120/royal_paper_shredder_customer_service.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/75017842043.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD222 5352 bytes
SHA-256: 80f99a4ca1c3517fb058189531fa5b24d57424eb408e4eda905e38d49247af44
font_01_sfnt_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 10888 bytes
SHA-256: 72c1465931b8216866bc6d22adaae54d585054a22dbe4b97397def5114137349
font_02_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 16096 bytes
SHA-256: 43254c6337662e76ed67025008a42d76121bee43b935a85a5f582473253d5118
font_03_sfnt_off00011e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E62 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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