Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d77331a38f2ff4…

MALICIOUS

PDF

83.8 KB Created: 2021-04-07 07:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8612a5edb56b819febb6443c5dabc2c1 SHA-1: bd4887d0c330c3f85d582d3136db6f44954f89bc SHA-256: 13d77331a38f2ff46f188e94587df6b9a1d696cd98ffab9ad659e5dfe6e7abd3
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, suggesting a link farm or SEO poisoning tactic to direct users to potentially malicious sites. The document body, though heavily obfuscated, contains keywords related to 'smoothies recipes for weight loss pdf', which is likely a lure to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/award?keyword=smoothies+recipes+for+weight+loss+pdf PDF link annotation
    • https://cdn.sqhk.co/letijefa/agcijgg/siren_head_horror_game_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/joziroluxu/hgjiLji/19674567784.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/Nhi041P/51835781270.pdfIn PDF document text
    • http://fragcups.com/75883423295mjd6s.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/hbYgfWt/72996649061.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/XGRa4vR/fivumuturipez.pdfIn PDF document text
    • http://hytri.com/jawamugefosivekerowawekubtutf.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/hhbnDgh/draw_out_salve_for_boils.pdfIn PDF document text
    • http://ranking-se.com/landscape_in_the_mist_movie_free9t1x4.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/jgF8ici/racing_the_hill.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/e489d49b-1d7c-4cef-8559-93425c368973/penikonunevudurifapubavin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2459f8c0-5f25-4200-a256-670ef249c1ff/heat_n_glo_fireplace_turn_off_gas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdbbe55f-b1f0-4e9a-9e39-2fbc96dc2eb5/14162093294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a7b881-9d2b-42b2-bccb-6446cc765635/what_is_a_literature_classic.pdfIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_76a3b63347b34daca95ba5a378d134a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ff9392-a140-4ab8-83b1-adfe77075a14/lizolikemagotamokow.pdfIn PDF document text
    • https://ac6a5e95-3fab-4d4b-a7e7-0ef4c71e5929.filesusr.com/ugd/32c278_729ac1cd8d214757842bb7b33aa359e7.pdf?index=trueIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_d6edc49f7f584366a81f8427d0518b7e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf63245-00b1-442b-98ac-0510656cb74b/nalawubigepesemelowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa218d4-95fd-43da-82bc-0e1a757c1696/befonutix.pdfIn PDF document text
    • https://b81f28a7-a6cc-4df9-aebb-a76b708ee4b5.filesusr.com/ugd/df05b2_9be32c6c918f4e7c8221629cfc81b34f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/071efc5e-845d-4ab6-9076-3bb0c515817b/74331915245.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_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 5552 bytes
SHA-256: 78ddb779862c61374b8e54b1099be27b85cdf007619fa666007d779f97666467
font_01_sfnt_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 11500 bytes
SHA-256: 2abac3c0bc3373d7605c833de3d66273d61bf028448f2aa33eff2bfdb16b7b7a