Malicious PDF — malware analysis report

Static analysis result for SHA-256 2136897ab52ccfdb…

MALICIOUS

PDF

78.5 KB Created: 2021-03-12 02:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1fb25f78fecea04e58a77aee6fd669b0 SHA-1: 755076036b06dc0e3cf14d64f4a05533e1fe8bdc SHA-256: 2136897ab52ccfdbee165c07372f10617c12c6810dd679979205ece1526b4350
186 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 0.9997

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://botokaw.ru/123?utm_term=easy+lemon+sheet+cake+from+scratch PDF link annotation
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/jewavinute_vufufokuzaj_munarukes.pdfIn PDF document text
    • http://artyom.guru/bhagavad_gita_in_english_ebook_free_downloadrm4z0.pdfIn PDF document text
    • http://excellent-spb.ru/pixofadazebaxutjahxq.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/a4v18dY/beat_bop_pop_star_clicker_mod_apk.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/turalojolumawebukokuwde795.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401971/normal_5fe3c2e455d9e.pdfIn PDF document text
    • https://cdn.sqhk.co/dabeluza/THPhcjc/smackdown_wwe_wallpaper_new_title.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409801/normal_60045d835a408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463272/normal_5fdb0e8c0b73e.pdfIn PDF document text
    • https://vatemiseviweriw.weebly.com/uploads/1/3/1/4/131453097/ab39df5f21.pdfIn PDF document text
    • http://rineset.xyz/92520966758hrdp5.pdfIn PDF document text
    • https://cdn.sqhk.co/xeliwiwogivo/cjbahiD/4k_gaming_wallpaper_for_mobile_1920x1080.pdfIn PDF document text
    • http://easycreditscore.info/212708187139oth0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_cf9979a90d1c4128a4f13dbe20beefad.pdf?index=trueIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_911496d3fce442bc8411492e7a0b2766.pdf?index=trueIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_9ce3d6dcfc0f4bf48ebd02263eab4109.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_59f65ca6814d4e05b96481796c2e79bc.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_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 5244 bytes
SHA-256: 610eb9472090c9a075a1d31bf97b15db1860e9dffce7f0a474e42c780b4138d4
font_01_sfnt_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 10912 bytes
SHA-256: 531c666eb157d3d3fdeab82d94a08cae95abfe937c80fe90dee005eef0b92fbb

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