Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4755e11cb4b60d3…

MALICIOUS

PDF

80.7 KB Created: 2021-03-07 06:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 03d10b8a579c31326c50ab02611aa428 SHA-1: 100604a3f334ca6a63a3dab5abb4c697ccdc4508 SHA-256: a4755e11cb4b60d33f6628216dee0dcc372f4941b929e896c7c3181c8ec3a198
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 0.9998

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/aws?utm_term=is+there+a+movie+called+dork+diaries PDF link annotation
    • http://soinjaga.ru/highlight_ipad_freeq7lzx.pdfIn PDF document text
    • http://lovotilowojixo.iblogger.org/lubasodemusejusaveteluz.pdfIn PDF document text
    • http://oneitshop.pro/20500107059ycwae.pdfIn PDF document text
    • https://cdn.sqhk.co/wuladupuzo/ijibjg7/45982290336.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495055/normal_60023e948179e.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/Ihdgjge/sopiwarefiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477163/normal_602e016eeb4d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403948/normal_60378772184c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dutuxiratuno.rf.gd/18509637588.pdfIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_64c9dc8a64bb4072b3401b91cc14bf02.pdf?index=trueIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_7c898dc9ff7044419fd77a1f68fa63d0.pdf?index=trueIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_badd5f09b8dc4eadae8bb169fdce7686.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_f31af00ea4d649b8945da3da3768cea6.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_d32fa956cad14fa18b7429051f5f29d3.pdf?index=trueIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_fd1638c1194a433f94498a7f47b0cfd5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 4920 bytes
SHA-256: 76f4c4e3f00c8b99af6db96cc7b9d2ee47eca4375867eaec001427397a5a008e
font_01_sfnt_off000101c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 11332 bytes
SHA-256: bcbaff4d45a5b929334d8f5648b4b2c2f1a3afb32a45cbed3c39e73a3c99a7fd
font_02_sfnt_off000127df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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