Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3b3519f1ac57c5…

MALICIOUS

PDF

77.4 KB Created: 2021-03-21 03:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dc6f5c2db8b999ddc9fbb4373df8b6e6 SHA-1: 80c9ffaa8699eb1de315beb79d0869c8a9a15fa8 SHA-256: 5c3b3519f1ac57c5fa669d78379d3098f7c8c6bb3412cce878e0fbe6f6f2a231
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 0.9995

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://druttle.ru/aws?utm_term=what+are+the+4+types+of+sentence+structures PDF link annotation
    • http://auto-agents.space/pumofadiknnv0e.pdfIn PDF document text
    • http://beautytopshop.site/download_film_divergent_sub_indo_720p7xvik.pdfIn PDF document text
    • http://extraevents.ru/coleman_furnace_parts_distributorspkev6.pdfIn PDF document text
    • http://nubemeketetu.mypressonline.com/vocabulary_with_meaning_and_sentence.pdfIn PDF document text
    • http://smartradiobf.ru/dark_souls_remastered_guide_lobos6l97x.pdfIn PDF document text
    • http://fakts.design/dizupitefivetaruvuraluke6x3d8.pdfIn PDF document text
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/wufogik.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/2006_yamaha_v_star_1100_classic_owners_manual.pdfIn PDF document text
    • http://f13x.xyz/dolores_cannon_the_convoluted_universe_-_book_fivemoshw.pdfIn PDF document text
    • http://vivadoctor.ru/44463629045nf5yx.pdfIn PDF document text
    • https://lejiwukepefi.weebly.com/uploads/1/3/4/4/134467113/xagoja.pdfIn PDF document text
    • https://zowololo.weebly.com/uploads/1/3/5/2/135294949/rododuzijazujikegoto.pdfIn PDF document text
    • http://ericksandoval.com/what_is_the_best_heating_pad_to_get310b0.pdfIn PDF document text
    • http://nesarose.sportsontheweb.net/negapazesig.pdfIn PDF document text
    • http://rezltml.xyz/94642440773myr5k.pdfIn PDF document text
    • https://divupitibi.weebly.com/uploads/1/3/4/3/134328085/fa6914f8.pdfIn PDF document text
    • http://my-credit.info/5859099648z57y3.pdfIn PDF document text
    • http://stav-games.ru/zefapobx15x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_52c0508fd0ac4228b9127dd7bcc497a1.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_1fcda31b268b4791a5dc185793bb6830.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_16f5fcb2b5c24c48b2bcac83db242524.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_a2cc88c9a5364470bcf99783d42118b1.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_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 5272 bytes
SHA-256: 1403c09a1b51ff7fe0353fcf1cdf28dfe038296bb59d6600e1f389a5709f6801
font_01_sfnt_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 10688 bytes
SHA-256: 73e67156fd05e0aad89a129fef229db05ec39f954bd2d14dd2f40eae9e12eb7b

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