Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad2fb0ae5019b16…

MALICIOUS

PDF

78.3 KB Created: 2021-04-22 15:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dec0112a813b72640eb8363bbad3b49a SHA-1: 814bc59f4b5952926893a20d0c29de973bad58cb SHA-256: 4ad2fb0ae5019b169ee34b48737fd51b7282bf059f012beeb94b4d6681c56c48
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the nature of the embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=what+kind+of+battery+does+a+2013+dodge+avenger+take PDF link annotation
    • http://vitodibiwanezej.mypressonline.com/a_christmas_carol_novella_study_guide_answers.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://idealica-italiaoficial.site/the_scarlet_pimpernel_movie_2013d934o.pdfIn PDF document text
    • http://gelchlen.fun/25715466596k364d.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/iejcwhj/88005245292.pdfIn PDF document text
    • https://cdn.sqhk.co/wanolugago/EifvI07/car_crash_deaths_per_year_in_the_us.pdfIn PDF document text
    • https://wemivera.weebly.com/uploads/1/3/4/3/134311686/junukik.pdfIn PDF document text
    • http://peguxukeziku.sportsontheweb.net/adolescent_health_care_a_practical_guide.pdfIn PDF document text
    • https://bewirupudafa.weebly.com/uploads/1/3/1/6/131607000/b762a5a0e1b0ea3.pdfIn PDF document text
    • http://tersq.fun/edmodo_answers_hackpx0au.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/X1QhaIf/11761693309.pdfIn PDF document text
    • https://jomokojexenubi.weebly.com/uploads/1/3/4/8/134877089/jojesebuzakokolasev.pdfIn PDF document text
    • https://cdn.sqhk.co/fosiwesigi/gfgeghf/50477328767.pdfIn PDF document text
    • http://idealicaitaly.site/relivasehk3lb.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/tigozevela.pdfIn PDF document text
    • https://ruxapumuful.weebly.com/uploads/1/3/4/6/134682584/peteposajomonur-xipoze-zekisolepikudiv-tazikadopili.pdfIn PDF document text
    • http://zawopim.mygamesonline.org/oracle_autonomous_database_for_dummies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://retasanege.rf.gd/apa_style_reference_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d633f89-667b-4c71-91e9-f49f20ed07be/how_to_get_vengeful_sun_god_btd6_2019.pdfIn PDF document text
    • http://tenudif.epizy.com/what_is_normal_nerve_conduction_velocity.pdfIn PDF document text
    • http://gixopiv.onlinewebshop.net/attacking_network_protocols_james_forshaw_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e19afc-9490-4690-9a7a-bf5db96b43ce/83005881278.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_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 6004 bytes
SHA-256: 257ff7f1727767e1b0b8b46429f08dfb33e7f308ca6c9d70f75fa4bd7feaffd2
font_01_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 10680 bytes
SHA-256: 01aaefa84f7801edb7625296e2fc0a1918375e8d4d302e5a461925ef0a88bdde

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