Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fa3a6c45ad5423…

MALICIOUS

PDF

87.4 KB Created: 2021-03-04 19:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5ce9151fd72b71bf6d83e8f9b899720f SHA-1: ae65b3d3b215587ef3df5837410b1d9d5a9f2a04 SHA-256: 19fa3a6c45ad542319794b1872f4b51c3163715c39cb3e3508ace412454739c5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to obscure malicious redirects. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://ponafet.ru/aws?utm_term=pilgrim%2527s+progress+audiobook PDF link annotation
    • http://berozava.iblogger.org/91766410867.pdfIn PDF document text
    • http://digtalcaliper09.xyz/adventure_capitalist_guide_2020qser8.pdfIn PDF document text
    • http://igcopyrightverify.com/partition_mistral_gagnant_piano_grat9kuqv.pdfIn PDF document text
    • http://leoidet.xyz/ti_30x_vs_ti_34d7bep.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/eee220bb-de27-40a2-9861-7f35e096dce5/50422893839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17d6415-a4ff-435e-88d9-0bd80350ad02/83940667428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aabc44cf-a43b-4e58-9975-7a5dfa4e2c74/zirata.pdfIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_3973e1fcc83249fd8b39782f75a3f12d.pdf?index=trueIn PDF document text
    • https://14d2622d-10f6-4733-b19d-678b7200eaed.filesusr.com/ugd/4b68be_3e820ceeeee945d2a7309ff58e4322cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fff3467-f06e-4a0d-8d3f-a437199825f4/monkey_business_bar_fort_lauderdale.pdfIn PDF document text
    • http://metepukiwameme.epizy.com/clear_rubber_sheet_bunnings.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_d87bc2079a5f44c5848ab220bfb526cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2043874a-2d0a-4f10-8df8-d219b8876269/hamilton_beach_roaster_oven_turkey_temp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90af30f4-3e65-420d-aca8-5284c26e7265/big_green_egg_accessories_online_canada.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_6ce1529dc6004c5fb66560990aba48a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc22e2e0-66fc-4cf6-ae51-26c2a2ca199c/24042707118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00ac01f-f914-4f23-9895-1476040520a0/wordpress_admin_page_not_available.pdfIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_96b63984c12b48728bed9da838ff5f83.pdf?index=trueIn PDF document text
    • http://migipusisi.epizy.com/the_maze_runner_book_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a78a21c-b5d8-4cb5-9c28-6a77d3a41bd0/how_to_study_advanced_management_accounting_ca_final.pdfIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_6aa591da005647559c6cbed42b977c92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4dba4b-53d0-4cc3-be44-8a7579daab19/41871156950.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_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 5216 bytes
SHA-256: 2442ecd5a6c02d8a5d6411eacebb215b275324b80ef4747b4fa610655a89c158
font_01_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 10920 bytes
SHA-256: 6d11056ae63ee2dc633493680c90fb7550e903d441120017b9688caf3dc4c9a4
font_02_sfnt_off00012ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE0 16084 bytes
SHA-256: a05a94f5a61380f8b68f9e28bec524af58f02ef796b832beb96c9dc973f1f214
font_03_sfnt_off00014199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14199 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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