Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c56b14d5e194d0e…

MALICIOUS

PDF

79.1 KB Created: 2021-03-12 02:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bf51892af866c0453ddd670bf3bbcb68 SHA-1: de8f2c9349ca2f98f3e2ed56089390b1f8a71e5a SHA-256: 2c56b14d5e194d0e716f0b61e1502f9e53bbc7da3db20dfd25f5e4de51be3bb6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=asl+alphabet+printable+pdf In PDF document text
    • http://figupatofewox.iblogger.org/classification_of_matter_worksheet_chemistry.pdfIn PDF document text
    • http://sizegivip.22web.org/higher_degree_polynomials_worksheet.pdfIn PDF document text
    • http://pomirkapa.site/zombie_gunner_raw3q6zc.pdfIn PDF document text
    • http://reetodo.online/zofilatuluvegivu7ofig.pdfIn PDF document text
    • http://gradstroy.su/english_dictionary_for_beginners_online_cambridgelw8t3.pdfIn PDF document text
    • http://generatorsale.ru/gexalexasiwo2sqfs.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/fallout_4_ps4_controller_pc.pdfIn PDF document text
    • http://lessonsonline.site/802924513955d13w.pdfIn PDF document text
    • http://afracheat7.xyz/dirk_gentlys_holistic_detective_agency_book_reviewzp2ig.pdfIn PDF document text
    • http://itdiscounts.pro/818170570960dqe0.pdfIn PDF document text
    • http://ipatovaalena.ru/voxipemunimodoqrryi.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/kadufazemesugoxirip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_1b6d65eb64c44a32a3374e62aec0b794.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba1a2b0-8b88-41e0-a3f1-895902f71e06/96746000890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef2341f-98a3-4c36-b9d8-7b31ff44760f/arctic_king_portable_air_conditioner_p1.pdfIn PDF document text
    • http://temomuduzuba.epizy.com/sailor_moon_crystal_jupiter_transformation.pdfIn PDF document text
    • http://puribisipup.atwebpages.com/dafobiduluginuriju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/480f1a18-a9d3-41ba-8227-90d6ec123798/sims_3_cheat_move_objects_off_grid.pdfIn PDF document text
    • http://dowexibagodi.epizy.com/76669410046.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_378384e9d40f4e51bfb3660614f6a820.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABC 5256 bytes
SHA-256: 385f955863802153df2b23d8f46104235378e1b1a9a0160f8eeb67403ea97816
font_01_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 10184 bytes
SHA-256: a0729681edcf68e2851a84b1b051c8a32202af0ed3168a758149bc9bd4e58e76

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