Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1c07a990d9ce01…

MALICIOUS

PDF

75.1 KB Created: 2021-04-09 14:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 40689b3683bf46e61b78f3be404dcba5 SHA-1: 82471c8f56ddcaafca04ce92dd6910cacf684be0 SHA-256: ec1c07a990d9ce017766fdbb592e4198be9c207728f65cea01e832f0254bf45e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous external URLs and the 'PDF_SEO_LINK_FARM' heuristic indicate the document's primary purpose is to redirect users to potentially harmful sites.

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://zajinet.ru/strik?utm_term=how+to+start+a+startup+business+in+kerala PDF link annotation
    • https://daxakowov.weebly.com/uploads/1/3/4/7/134704390/9625140.pdfIn PDF document text
    • http://xuritepizib.mygamesonline.org/88226297669.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/SqifRnK/tap_tap_fish_mod_apk_1._14._1.pdfIn PDF document text
    • https://lijepaxo.weebly.com/uploads/1/3/5/3/135324298/mesoloj.pdfIn PDF document text
    • https://ketafimevudo.weebly.com/uploads/1/3/1/6/131637081/7690598.pdfIn PDF document text
    • https://tudiputowol.weebly.com/uploads/1/3/1/4/131452732/630de36af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419424/normal_606df01ddc367.pdfIn PDF document text
    • https://xijexarara.weebly.com/uploads/1/3/4/0/134017378/4777155.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/RgSuhcz/nujeb.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/hjgiejg/towufupitigak.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/jijegku/58375474783.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/WpgjXhj/sajelizelanojididok.pdfIn PDF document text
    • https://cdn.sqhk.co/kojariwirip/cFieRhb/10345424311.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/banosujogixeso_wuluxigisovomo_lajifowogaret_fudaxowo.pdfIn PDF document text
    • http://warewakeb.sportsontheweb.net/capital_markets_institutions_and_instruments_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_60111a18649ef.pdfIn PDF document text
    • https://tidoxanarapora.weebly.com/uploads/1/3/2/7/132710787/485473.pdfIn PDF document text
    • https://detifurotuso.weebly.com/uploads/1/3/5/3/135321595/lipubilolimuxujeda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 5072 bytes
SHA-256: 6f7533f6b19d4d0c8fa42525ce4dd875c03750ef5869a4bd3c80fa694a20dd9a
font_01_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 10200 bytes
SHA-256: 32973e0fd8f89e6d5b04441d593aff338e5266361940a264b51bbcc180501d28

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