Malicious PDF — malware analysis report

Static analysis result for SHA-256 066db57c8a8bbefb…

MALICIOUS

PDF

73.2 KB Created: 2021-02-18 08:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d4ffc5a2b774e0407daffa63b5a03ff3 SHA-1: f4406549ee466abb6ba7419a55753090c793a4e6 SHA-256: 066db57c8a8bbefba389264e4ad612159f38db5d7c510f3c4733da4d8ef1e2d3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV both strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

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://druttle.ru/wix?keyword=lesson+5.3+kite+and+trapezoid+properties+answers PDF link annotation
    • https://dutilugamon.weebly.com/uploads/1/3/5/3/135301630/8c218f.pdfIn PDF document text
    • https://tiguziriwisil.weebly.com/uploads/1/3/1/0/131071210/muvemizodagosodur.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/Cbhgih3/3554633073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384650/normal_5fe60e34c2c55.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/gjjegf6/rusty_memory_survival_vip_mod_apk.pdfIn PDF document text
    • https://nawiveburejofi.weebly.com/uploads/1/3/1/3/131381882/28563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_5fdc336c31f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_600d1b2b11dcd.pdfIn PDF document text
    • https://diwimiwiwomenen.weebly.com/uploads/1/3/0/9/130969795/seroloditeda-punejajinogovuz-fogagajomako-nemumepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5fe607a37f17a.pdfIn PDF document text
    • http://kawlites.online/tafuvixanyez4.pdfIn PDF document text
    • https://cdn.sqhk.co/guvelebul/ghgijZO/vowemewiwajujuwejisaneje.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/xEid4D8/evil_cogs_chapter_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500450/normal_5fc8b36726631.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/jghfEgh/1884186596.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://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_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 5176 bytes
SHA-256: 3a14b37dbee55ddd792019a5340c00a59bab40ec7ab5cee74c56a1763a87c49b
font_01_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 10208 bytes
SHA-256: 7ba97ae6aa2c72514e2b5f07eb1811de98f0d09bd9c605eede86074890d4ab32
font_02_sfnt_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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