Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a049542bd8e8cd3…

MALICIOUS

PDF

75.4 KB Created: 2021-03-22 01:59:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 04fb0009a39c166af31d2d8e0a043863 SHA-1: 72254832e6a30937f8c5bfccd70714dcddcf85cc SHA-256: 1a049542bd8e8cd3a33f58c5c1cecc1d52cff558325b02968b2c2f9ca8c3e57e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting, and exhibits characteristics of a link farm. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, suggesting it was generated programmatically. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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/wix?keyword=benton+high+school+il PDF link annotation
    • https://donabetolemi.weebly.com/uploads/1/3/1/6/131637402/8243377.pdfIn PDF document text
    • http://vufiwopader.medianewsonline.com/benim_hocam_tyt_kimya_video_ders_notlar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_60543af71e295.pdfIn PDF document text
    • https://jorojesa.weebly.com/uploads/1/3/4/8/134861508/5d54b8308449.pdfIn PDF document text
    • http://winopufivugum.22web.org/canadian_visa_application_form_cic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451352/normal_5fe55649d9840.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/angel_broking_closure_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_6036d33b1c7b3.pdfIn PDF document text
    • http://bapefajavijofo.66ghz.com/junopesuwexudoxomunelewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419640/normal_5fd3d17379092.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/huckleberry_finn_chapter_20-25_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485704/normal_5ff1cc1b53a03.pdfIn PDF document text
    • https://wufipalowev.weebly.com/uploads/1/3/4/5/134595621/3171115.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/sudoxerizobakerijon.pdfIn PDF document text
    • http://suwadebizon.mywebcommunity.org/77936423369.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiforeru.atwebpages.com/ronogojug.pdfIn PDF document text
    • http://jofikuv.atwebpages.com/7483229420.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/fipaxozejowub.pdfIn PDF document text
    • http://pubejasebalodo.rf.gd/co_operative_housing_society_bye_laws_2020_in.pdfIn PDF document text
    • http://zakesebamorime.rf.gd/77390315649.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/preeclampsia_eclampsia_hellp.pdfIn PDF document text
    • http://pagolojesuwagi.epizy.com/oxford_dictionary_english_to_bangla_software_free_download_for_pc.pdfIn PDF document text
    • http://bixerexexotepe.rf.gd/english_textbook_for_class_10_ncert.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_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 4804 bytes
SHA-256: 40a0681ee5580083e890ddee0a81a6b6167d9692aea1976ba9e55d61763ed75b
font_01_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 11008 bytes
SHA-256: 7ef302225f6ab8ac629d7f6f580d10de5337dd1d347062239f9060d09b7d24dc

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