Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a08f4e0082889d…

MALICIOUS

PDF

67.5 KB Created: 2021-02-28 04:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 528866586c3e1392d2891267f2696f64 SHA-1: 7824c99cdb13517e4b6295b54cdfe344453b48e5 SHA-256: d4a08f4e0082889df1f6ba689ffb715168f716451d58a187ed7fd4b6092930bd
146 Risk Score

Malware Insights

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

The PDF contains malformed streams and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It includes numerous links to external websites, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the heuristic identifying it as a link farm on disposable hosting strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://golowaki.ru/123?utm_term=samsung+wa400pjhdwr%252Faa+parts+diagram PDF link annotation
    • http://penageli.getenjoyment.net/87657509924.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/pogimenisurinefofojid.pdfIn PDF document text
    • https://veliwomi.weebly.com/uploads/1/3/5/3/135343105/sudusamikujob.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/49752750100.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/when_someone_winks_at_you_what_does_that_mean.pdfIn PDF document text
    • https://fodukajanewirom.weebly.com/uploads/1/3/5/3/135383911/virizoni-tupejoxuxuzas-leneluk.pdfIn PDF document text
    • https://nefovevetovuj.weebly.com/uploads/1/3/5/3/135390951/18418.pdfIn PDF document text
    • http://folugomobok.getenjoyment.net/21805929581.pdfIn PDF document text
    • https://tulidakavixesa.weebly.com/uploads/1/3/5/3/135347336/wimen_wesomukavikide.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/escuelas_contemporaneas_de_la_psicologia.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/bimukurewo_lodevusepi_zusogidofanawe.pdfIn PDF document text
    • https://kitawusew.weebly.com/uploads/1/3/4/2/134234725/doxizu_babug_muzonarirorux.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/83700290254.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wivowutone.epizy.com/gapuwod.pdfIn PDF document text
    • http://pewulalabes.epizy.com/the_rules_of_basketball.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/sewejujoraw.pdfIn PDF document text
    • http://milovuzojed.epizy.com/kezara.pdfIn PDF document text
    • http://lavorusopanutaw.rf.gd/samuzemevaloxula.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/ar_15_parts_for_dummies.pdfIn PDF document text
    • http://benamow.myartsonline.com/what_is_breach_notification_rule.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_off0000c8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 5876 bytes
SHA-256: 086851eeb17e1eda90aefceb2927d0cd160e759ffb806507a6cd9b74e272540d
font_01_sfnt_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 10484 bytes
SHA-256: c06751cd3dc27ccc32285ac58ae4db625089b3fdc4d97910da049dbadc91a713

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