Malicious PDF — malware analysis report

Static analysis result for SHA-256 84637ff517b9f0bc…

MALICIOUS

PDF

71.6 KB Created: 2021-02-21 13:23:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8132ceda63189f67b523d51ad319b772 SHA-1: 5b7b953a842960d09d5a09de0957bcee6ece1c6b SHA-256: 84637ff517b9f0bc39a0a0d84e5dbe494e949556adeb4231798f17b58dfc59a4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

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 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.
  • 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://bologen.ru/strik?utm_term=where+can+i+find+zip+code+plus+4 PDF link annotation
    • https://cdn.sqhk.co/bopibege/NmAhbhi/hashtag_generator_free_linkedin.pdfIn PDF document text
    • http://lazadacostumercenter.com/88567458280wh0tl.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/hgKvhhh/36767365836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_601cfde0653f6.pdfIn PDF document text
    • http://dreamingdeveloper.com/cisco_packet_tracer_commands_cheat_sheets8sec.pdfIn PDF document text
    • http://ukranews.site/internet_browser_for_pc_free63uvg.pdfIn PDF document text
    • http://llloooodddd.space/45049858129fx7la.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/16c1d87bcac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_60155776ae03b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_601b0d9d6f541.pdfIn PDF document text
    • https://fezekisovo.weebly.com/uploads/1/3/4/6/134661064/1823391cf3ff.pdfIn PDF document text
    • https://fadabavawabup.weebly.com/uploads/1/3/4/0/134095990/nipufubi-senogubuvobulax.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/srBjahk/party_city_promo_code_oct_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368218/normal_5ffc323ca4dcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_6010ddee18189.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/8392753057.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/formal_dress_code_for_wedding_guest.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/childrensalon_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/zumobuxuruw.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/diffusion_and_osmosis_worksheet_despite_their_difference.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/vituvisulasupuvefubupifu.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/65328169268.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/fixusajeselupegifaborumol.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_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 5392 bytes
SHA-256: 839441345e0dd1d91469e6192f6bebb4fd32cce2fabf033539cf8fc99a13890e
font_01_sfnt_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 10428 bytes
SHA-256: 9a94e6a8a5190ac8b2a211718b21d27d659f7dfe9670bad7b46fbcfd32368b0b

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