Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9bc68f829152ae…

MALICIOUS

PDF

82.6 KB Created: 2021-03-28 02:33:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 429be89747d0728e917c992387e3ed81 SHA-1: 9f1f8411024201ae17b38b6a5f3aad60a8ddb4cb SHA-256: da9bc68f829152aee22fca51bceea036503ce7aadeabe6900bad9237b63297b4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a notable concentration on disposable hosting and potentially malicious domains like nipisod.ru. The document body, though heavily obfuscated, suggests a lure related to 'headway beginner video pdf', indicating a potential phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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.
  • 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://nipisod.ru/award?keyword=headway+beginner+video+pdf PDF link annotation
    • https://cdn.sqhk.co/vunelebu/0ygdZjc/guardian_tales_3-_1_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481528/normal_5fd31604b232a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415929/normal_6055f66a54869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_605f9acd1e0df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410983/normal_6044cdf2a37e7.pdfIn PDF document text
    • http://lozuzaragujeb.mypressonline.com/mercedes_a_class_2020_brochure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503584/normal_5fe98849b2b03.pdfIn PDF document text
    • https://cdn.sqhk.co/setanutoba/FLxjbiD/53715722338.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/ihjdhge/68843338841.pdfIn PDF document text
    • http://guxetiz.22web.org/padog.pdfIn PDF document text
    • http://texivej.sportsontheweb.net/aptitude_test_with_answers_download.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/hdGPgii/99769622029.pdfIn PDF document text
    • http://pibolatekotojir.22web.org/51359622073.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/nSkheje/dupalize.pdfIn PDF document text
    • http://terugate.mypressonline.com/que_es_dibujo_topografico_yahoo.pdfIn PDF document text
    • http://bigijawiv.scienceontheweb.net/how_to_flush_mount_hampton_bay_ceiling_fan.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/06b8acdf-4f83-45cd-b9e8-3434ad0ad126/how_to_greet_someone_with_terminal_cancer.pdfIn PDF document text
    • http://lekeviwa.onlinewebshop.net/topaxevapobupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/598d63b0-7dad-4864-8f23-94fc80d1b7ed/95556593118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5761231-41bf-4642-a0fc-8c257229a9d3/15882294750.pdfIn PDF document text
    • http://vofabij.epizy.com/reflexo_bicipital.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0bdbe1-057b-4704-a006-83211d1ababb/80735992270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76334e3b-f9ef-4d5a-a5d4-b744850b75d0/what_are_the_differences_between_impressionism_and_expressionism_art.pdfIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/pawefoxafo.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/28476982350.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_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 5060 bytes
SHA-256: 27118792b9928d1d47f4114d5b2706d4830f809a66552b53304293a97c0c8513
font_01_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 10840 bytes
SHA-256: 0609be2c30481d70638ba52299bf4709638dc20dbe966ba60746c1b29ae795a4
font_02_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 16352 bytes
SHA-256: 4c01831bdfffbafff55fd55c88415eb2201da44b622d6ec769a15ea8bc50db3f
font_03_sfnt_off00012e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2