Malicious PDF — malware analysis report

Static analysis result for SHA-256 71108e8feb79d0ba…

MALICIOUS

PDF

87.0 KB Created: 2021-03-17 01:14:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 76e07e23e4e65e9538c17c15c6864a19 SHA-1: e6fcd96e53159d3367f0df32fef2e64812ffd6ef SHA-256: 71108e8feb79d0babf71bc245da060b8e74c416c6b48d5231dc908a8c3845eb2
186 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. 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 0.9998

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://jacksth.ru/wix?keyword=8+ball+pool+cash+generator PDF link annotation
    • http://yourdesk.website/capital_market_instruments_definitiona0nee.pdfIn PDF document text
    • http://kinoxca.xyz/tosogowigoxexea8nhv.pdfIn PDF document text
    • http://by-roof.ru/memomedadogujexofefagy82wu.pdfIn PDF document text
    • http://pukimupupe.22web.org/physical_science_online_textbook.pdfIn PDF document text
    • http://llloooodddd.space/makalah_ahmadiyahdjmw1.pdfIn PDF document text
    • https://denalozi.weebly.com/uploads/1/3/0/7/130776502/jerapazidizop.pdfIn PDF document text
    • http://torchqbfl.fun/image_editor_windows_xp828pv.pdfIn PDF document text
    • https://noxijinijomud.weebly.com/uploads/1/3/4/7/134746703/mibudufovavulowozaj.pdfIn PDF document text
    • https://wusumojasojufe.weebly.com/uploads/1/3/4/3/134352244/8930948.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_43fc28537af64f6fae395e7ded8d2b7d.pdf?index=trueIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_ef6c9b7c6cc7469e839b580a7667b5c4.pdf?index=trueIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_1a1817495b2e451e947bfe0c925ac78d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/tipos_de_metabolismo_bacteriano.pdfIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_73e8e6be3de945bdb820f267b1a65291.pdf?index=trueIn PDF document text
    • http://mofomunor.rf.gd/gezopibak.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_cf1d773e264143c495a88d917843bf07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farezelof/transformer_coordonnes_gps_en_latitude_longitude.pdfIn PDF document text
    • http://kavunuses.epizy.com/zipumiliwex.pdfIn PDF document text
    • http://viziwufeki.rf.gd/tarazabakirojasa.pdfIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_003d7b3dc1b146719c4890401d496a39.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001166d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166D 5432 bytes
SHA-256: 74bcd29ac7eb840ea1b692be98217899490bd5efd0a147ace1ce539be6d4123c
font_01_sfnt_off000128d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 11284 bytes
SHA-256: a6756e505bb9a87e86832f7775847d73898d1e4c5e693d7fb23affaf83bce77b

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