Malicious PDF — malware analysis report

Static analysis result for SHA-256 6778032254f9d496…

MALICIOUS

PDF

81.1 KB Created: 2021-03-08 01:25:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 98e5614a3090fcdf240532cf6284d8dc SHA-1: 858ecedd06d620ef9a004996ea892f5366e55564 SHA-256: 6778032254f9d49693cd063a6fba38699b8b821a490e4f9007618cb17b758019
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 0.9993

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://druttle.ru/strik?utm_term=what+makes+humans+human+philosophy PDF link annotation
    • http://buylettersonline.com/99753599228nm42q.pdfIn PDF document text
    • http://tasigezagu.scienceontheweb.net/buwese.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/william_faulkner_as_i_lay_dying_summary.pdfIn PDF document text
    • http://voiprormul.xyz/560310202106vj67.pdfIn PDF document text
    • http://prizinsta24.space/lebidibofib3tz64.pdfIn PDF document text
    • http://meblik.su/korubupomigebaver2ehe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_600bf95fe8a39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445864/normal_6019d3fc1bd2a.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/whirlpool_edr1rxd1_refrigerator_water_filter_filter1_3-pack.pdfIn PDF document text
    • http://suberubepuparo.getenjoyment.net/3825092212.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426810/normal_5fc5ed577c4f0.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/sat_practice_test_3_answers_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496580/normal_5ff0a288baf85.pdfIn PDF document text
    • http://instapriz.site/adobe_illustrator_cs6_tutorial_classroom_in_a_bookqgbji.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/4a94a2af-d423-464a-a083-afb61969af56/conflict_resolution_worksheets_for_middle_school.pdfIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_0cb62c558a494ea6a5a27741d8610290.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_f82f17bdb28c4b498d249496fc72057b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a409ea-34bc-41e8-a463-94bf78dbf5f5/alain_de_botton_on_love_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a5a0349-33ce-4d32-8b8d-af3985489a34/ponowoxumezuwixujavesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba41d41a-2d18-4444-b1bf-135a54721cec/zasaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd4fb43b-05d9-4f3b-a076-7e7c39f67ce5/64836431617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b29b70-56aa-4dbf-8e03-e9618fbf915f/xenupijoxuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/181b439f-3400-4f89-8498-252d1a51889d/what_is_the_best_bait_for_striped_bass_fishing.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_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 5144 bytes
SHA-256: 3d80391c0f55bf5b2752961c63dd7e05ba397c2f71156f378e83008fefcd9230
font_01_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 11752 bytes
SHA-256: 92a92690b1a9be25f4720f4d941585c7902c574e783e7af5ab1ad4bef78edbdd