Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19b6d2b3c064136…

MALICIOUS

PDF

80.7 KB Created: 2021-04-03 13:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8e20be2c0398561efbbb42ad2177d30a SHA-1: 671c6ea42f286512f81061a424a0776cd292987b SHA-256: e19b6d2b3c064136acea22e69489e5e19d228f6187f5bbe6378b5b78cdc17231
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or SEO spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=what+colors+are+in+olive+green PDF link annotation
    • http://glawerry.online/96625055374wvx78.pdfIn PDF document text
    • http://elinekici.online/tajuzunubakasopolinumadid800b.pdfIn PDF document text
    • http://fruktovik.com/5971153726brxhh.pdfIn PDF document text
    • http://polypak.site/rokazezadoslqs0m.pdfIn PDF document text
    • http://proflist-barnaul.ru/funny_diy_christmas_gifts_for_friends4fp0c.pdfIn PDF document text
    • http://premium-cinema.com/571827622202m0g3.pdfIn PDF document text
    • http://kataeta.club/marketing_cloud_pricingq61as.pdfIn PDF document text
    • http://optarfes.com/8789912611958r48.pdfIn PDF document text
    • http://erogan-encolumbia.site/29641851491hvipf.pdfIn PDF document text
    • http://palitra-cveta.ru/introductory_functional_analysis_wit7lfu3.pdfIn PDF document text
    • http://raftgjgr.space/kenmore_he3_front_load_washer_repair_manualm8ugs.pdfIn PDF document text
    • http://bluebadgeapproval.com/lifting_plan_template_hsescxc7.pdfIn PDF document text
    • http://bioforce-co.site/83039405376dhk8f.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/75599896701ublpp.pdfIn PDF document text
    • http://lolkek.xyz/white_christmas_cast_vera_ellen_dance_partnerpavh8.pdfIn PDF document text
    • http://indital.fun/darlie_routier_dna_updatetm0be.pdfIn PDF document text
    • http://xrootunited.com/16145602069x5nog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_7f949f95f6584e12a1a1d8cdfa6763c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0aefae2-3cec-49c3-81b7-74ab9d827d2e/roligiv.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_0de7fd5eac7c4179a50c0ac9217c3e53.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c25b41-70c0-4dda-871d-af7ec67f60f3/34060898940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d527282-118a-4924-b3ec-e92529796789/honda_rebel_1100_hp.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_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 5136 bytes
SHA-256: b92f0f2a1edee6ed621db53f64bc0a88f221e85d10fc367a6f82b2c70cc21b1a
font_01_sfnt_off00010d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D61 11884 bytes
SHA-256: 3bd6af15519a7c69b3524c368cb58f5c16477ccf77aa1286a4e9f43d0ac621ba

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