Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c806dd7538341e…

MALICIOUS

PDF

82.5 KB Created: 2021-03-28 19:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ad54abdf28588302d3e850a1a34aeae1 SHA-1: eb2873b3b2e1f74dff53c27d0931377c2f0384fc SHA-256: 28c806dd7538341edec9a21aafe72b5e45608283f527663c702eac6cc9b2e73f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with a primary URL pointing to a suspicious domain that appears to be part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=identify+the+differences+between+bacteria+viruses+fungi+and+parasites PDF link annotation
    • https://cdn.sqhk.co/gefokinoxi/eew5cDW/business_administration_and_management_college_major.pdfIn PDF document text
    • https://cdn.sqhk.co/renosopezare/gdTiLjf/colossal_cave_adventure_source_code_c.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/74XdieJ/bowling_alleys_western_suburbs.pdfIn PDF document text
    • http://nibitekafo.22web.org/what_are_the_example_of_renaissance_period.pdfIn PDF document text
    • https://cdn.sqhk.co/rotefuver/aywf6zT/activity_launcher_android.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://gomilivif.epizy.com/ferowipapij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc0d62da-9819-4ece-8118-d955daa27d81/gatixovarukos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18558425-4907-41aa-a260-cdedf577f643/lukuxibaxevonigadawijes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a1305d-6a76-469e-a9f8-a11bb1ad06fc/what_energy_levels_are_electrons_found_in.pdfIn PDF document text
    • http://xapipapuvujefo.epizy.com/56022679083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690ce843-2bf0-40dd-bd29-d415016c5daa/zanowusovazenisezu.pdfIn PDF document text
    • http://matogojetize.rf.gd/846381224.pdfIn PDF document text
    • http://pudopidurisego.epizy.com/26116690123.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/teraleliwifatubi.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/82823545026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f383fd4-fed2-4eb3-b100-f57f8b650cdf/folewugobujuzumupuvupimu.pdfIn PDF document text
    • http://sarirasa.epizy.com/dixamimipeguzuj.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/question_answers_of_keeping_quiet.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/peduvixufusud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe3cca6c-4834-4aa8-9038-dec005817daa/febulalumolifo.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/seven_little_words_bonus_puzzle_2_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c89bd3a2-b99a-4eaf-9709-de3583fe2653/how_to_clean_a_bottom_loading_water_cooler.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 5488 bytes
SHA-256: 0d34ab8c7acd33f7b5e3ed0ca600058ac72877d4a7455a007c418c33a9e50450
font_01_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 10464 bytes
SHA-256: 2cdcf39cbb4867b60d51a443fd9cf9a0b996a03e2cbc6ce1fb3da0ce720d5e08
font_02_sfnt_off00012da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c