Malicious PDF — malware analysis report

Static analysis result for SHA-256 49da6d80cd8b3bd2…

MALICIOUS

PDF

82.5 KB Created: 2021-03-22 20:52:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 94e341fc088bbec4f226d2f95c6d6e85 SHA-1: fe277d65849fde78123610d4b68329677e9a7268 SHA-256: 49da6d80cd8b3bd21a64c9eb1d42ffb0746c8201f2506d4ca02f3a713c8600e6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm. Several URLs point to disposable domains or domains with unknown reputations, indicating a potential distribution or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/123?utm_term=13.+1+minerals+and+rocks+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/rokogikapo/jdRgdU3/xetoxodolofidonopalufu.pdfIn PDF document text
    • http://erogan24.website/ways_to_overcome_obstacles_in_your_lifeqyhan.pdfIn PDF document text
    • http://findonelove.online/zidejopajejujesudbk1r.pdfIn PDF document text
    • http://itasda.online/default_timestamp_format_in_oracle_11g1k15a.pdfIn PDF document text
    • https://cdn.sqhk.co/zegareguw/igOeicR/download_fruit_blast_knife_master_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/ib6p49Y/tusul.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://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_6c1925e6a5164b0ead49b54036dac3f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zedilegol/vufenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db0c72b9-1163-4177-8209-0997ce6b13b6/whats_the_healthiest_thing_at_taco_bell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc4e8f6-5e70-4b6b-9cea-b0dfad7102d8/lefojedigipojipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27bdbbbd-733e-49f0-8874-0b7b455fc0ac/30095401043.pdfIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_1fb72add18b445c287b8e0abde22737d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3593f7d-f22c-491e-b2a8-c98d5765cd39/wagiruxeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e4cd12-fffd-4d40-90b2-2dbe15d1b314/how_to_get_a_helicopter_in_gta_5_cheat_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff621f7-61c6-465f-b3e0-e828a00159eb/marvel_comics_sword_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/kutexebizemupoge.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/how_to_mr_coffee_iced_tea_maker.pdfIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_730b56e860334523a4591dd643c160c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5de10509-8d5c-4fff-9eb4-94f6bed26c50/curso_de_ingles_mensalidade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/391a0eb1-d35f-4a8e-9f8a-3005fadf88b3/what_is_bug_in_computer_language.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_15416ca63f194f26b3dfc5f473e57304.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 5276 bytes
SHA-256: 63b49ebe7f675b9dd33b9a8247f5dfb1a385b38c4b8251fd89cb1ed20bf5b8f5
font_01_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 9872 bytes
SHA-256: 097b37ea8740a43abd4f8763aa086d0ca8cc692e1c857dfb9751fa5579cf786e
font_02_sfnt_off00012e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E76 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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