Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8a5c791fe36af6…

MALICIOUS

PDF

80.0 KB Created: 2021-04-08 17:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 949fad89f4d1ec7fb73d62318246a7d4 SHA-1: 59a3b08387e2ff0c2b785f868760b7d0889c1c01 SHA-256: 9d8a5c791fe36af671e9ae2d418805d09a91e2fe0a1eb3612cc0897d08958349
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many pointing to disposable hosting, suggesting it is part of a link farm designed to drive traffic or host phishing content. The embedded URLs and the heuristic firings strongly suggest a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=vegan+gluten+free+lunches+for+work PDF link annotation
    • https://vuvunovugigadi.weebly.com/uploads/1/3/0/8/130814714/mufadizijovu_gaxoferawenuf_zefox_kabujanijo.pdfIn PDF document text
    • http://everydays.space/acr_gout_guidelines_2012_part_2c2s2u.pdfIn PDF document text
    • http://pokemonrivals.online/pipe_shapes_guide7xrlr.pdfIn PDF document text
    • https://duwawituku.weebly.com/uploads/1/3/4/3/134306950/6aa3c.pdfIn PDF document text
    • https://laxopewivizi.weebly.com/uploads/1/3/5/3/135394850/bakew-dufemomat-jitutixuxararot.pdfIn PDF document text
    • http://reduslim-sito.site/zetojefonas4satl.pdfIn PDF document text
    • https://bufekebutejef.weebly.com/uploads/1/3/1/8/131856184/7977579.pdfIn PDF document text
    • http://arendaavto.taxi/brs_behavioral_science_6th_editionxq3gs.pdfIn PDF document text
    • https://dotozirijekuzo.weebly.com/uploads/1/3/4/3/134315872/2050873.pdfIn PDF document text
    • https://jodowofimen.weebly.com/uploads/1/3/5/3/135330599/3fb255f1636a9.pdfIn PDF document text
    • http://homeolimp.com/the_rime_of_the_ancient_mariner_poem_line_by_line_explanationbqaqk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_592b5e4162784b6e903456e415f341df.pdf?index=trueIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_836b8f1443ba4c3ba54cec406d9dcf6d.pdf?index=trueIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_4cb4fdfb446c4335805c87321ebeef89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed336337-2555-47ea-ae71-db527bd2cf7d/used_lexus_es_350_for_sale_by_owner_near_me.pdfIn PDF document text
    • http://somifisuvukibuk.onlinewebshop.net/new_english_file_elementary_teacher_s_book_third_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/def741d4-dbac-446e-811a-75f90bed624e/70868271961.pdfIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_59950c586aa84280b4001b613d1b1acd.pdf?index=trueIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_69669ac4f5f84f77956383fae37c7858.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85555cf9-535d-4448-a593-6b95ff5a336f/69792475982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c7c9dc-aa8d-4ee1-94a0-3e777fcff82d/9145370798.pdfIn PDF document text
    • http://tikomiwewo.atwebpages.com/56121607617.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/duduzitusajuvisovulabaso.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_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 5264 bytes
SHA-256: 8a49d2d88c4b4696798997978dcfd395ba2a58d0308ae3e06934de7bb5d896d5
font_01_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 11280 bytes
SHA-256: e334b59df06f8a41c888b659c680da79ca4a5c2d4ea9b07ed4b156fc5b9285e4