Malicious PDF — malware analysis report

Static analysis result for SHA-256 8049e54d6150e3f7…

MALICIOUS

PDF

74.7 KB Created: 2021-04-13 05:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 471af5f454c949f8052140f01113ea09 SHA-1: b8f58b0d6504d901a3ae557d91e5752d78b6a980 SHA-256: 8049e54d6150e3f76b80f71ce3ab79dfc4400970cc2997d48e61b15dbce3107f
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://resalured.ru/strik?utm_term=cash+dividends+are+initially+recorded+on+which+date PDF link annotation
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/e0b6ef12f61011.pdfIn PDF document text
    • http://crysety.xyz/841186537671f6ha.pdfIn PDF document text
    • http://tubebegerisozo.iblogger.org/vaxagezugevitefumizure.pdfIn PDF document text
    • http://fruct.space/marvel_contest_of_champions_hack_2020_no_verification4jhg0.pdfIn PDF document text
    • http://clobuss.ru/download_army_battle_simulator_mod_apk_unlimited_gemsvrdhi.pdfIn PDF document text
    • http://freefire-gifts.com/2020_fraud_examiners_manual_u.s._editiona6jcw.pdfIn PDF document text
    • http://autoport76.online/6413961606b2mzx.pdfIn PDF document text
    • https://wavikifetin.weebly.com/uploads/1/3/4/9/134901048/sofozetutopajat-refafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_4a15fb7d7dcb43648c7c82f84764bdf3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24da8dbc-5c58-4474-8a96-b3f6e47032fa/zukovulajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9cfa57a-65ac-425e-89f6-797d386742df/ropivebeja.pdfIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_74d4a7e1d9d741519ab0aebfeb5db00e.pdf?index=trueIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_40046ac2d8c7441dbc834734f43ddf6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b2b3805-0351-4cf6-8a20-d4a3f8848f05/nuxonozokikasabitebono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae44a55-7baa-42d3-b4b1-1534bfad1d27/sony_x800_blu_ray_player_region_free.pdfIn PDF document text
    • http://fuvituze.epizy.com/34199190351.pdfIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_e0676eb5c2264f1899370f4d41390e91.pdf?index=trueIn PDF document text
    • https://20e8ec16-a7ca-487e-906f-4b2d5c2744e2.filesusr.com/ugd/ab81b8_497cd662edc9426d94eec17ec7808e14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da0528ea-4c40-46e1-be63-f81165c670ed/milabiforidinefube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/593a3059-8fb2-422f-8127-56ec04aaae40/please_find_this_i_wrote_this_for_you_and_only_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a284dcb7-b84c-4d33-8b8c-185a0f65cee7/harry_potter_characters_hogwarts_houses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/355ac57a-1817-4c91-a118-9fbff2e86f4a/mefoludijavoruluwob.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_off0000e6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 5184 bytes
SHA-256: 1d037400cdb31dff8d8657bf4cd25e0c1db7540f55446ec70ea1b4f7571f4ec9
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 10592 bytes
SHA-256: ee354fdee4b844007679544a9b9ececd1121da8bfbd7a85de0a06bec1763b10a