Malicious PDF — malware analysis report

Static analysis result for SHA-256 df923c13f75149b4…

MALICIOUS

PDF

67.5 KB Created: 2021-03-27 10:04:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3b7e9bfa69fd0862f8e4de9c189f1840 SHA-1: a6d16437062d07ad7cbd4660fcc4be5da2139fc7 SHA-256: df923c13f75149b46bea538a1005057d50cb56f9d44dc14414001fd56b8dfadd
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam, disguised as an academic document. No scripts were extracted, but the presence of multiple external URIs points to an attempt to redirect the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=boundary+layer+theory+8th+edition+pdf PDF link annotation
    • http://topmassage.net/when_it_changed_summaryxy4vp.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/jcFRLY9/bosch_classixx_washing_machine_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482406/normal_600413eca17ba.pdfIn PDF document text
    • http://whalesqpa.fun/ham_radio_deluxe_free_windows_10u9mgl.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/7a9Bicm/bujanujasonadumenoxalak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_602d60e13673a.pdfIn PDF document text
    • http://sununetapa.22web.org/levitagupodeja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_605d4a586eb3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxilapavaz.rf.gd/metro_map_shanghai.pdfIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_52ace854832e4f249c2777791c7aac82.pdf?index=trueIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_9061d8b2f19a4a72a5ab86bc605d65fb.pdf?index=trueIn PDF document text
    • http://girodolud.rf.gd/arte_greca_arcaica.pdfIn PDF document text
    • http://texatutegelemov.rf.gd/wetiteperadip.pdfIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_9145d7baed9f4d558fd1270c0dbaa2fa.pdf?index=trueIn PDF document text
    • http://mejufupivu.epizy.com/vivah_gali_geet.pdfIn PDF document text
    • http://kekerojuxofex.epizy.com/casio_g-shock_ga-110rg-1aer.pdfIn PDF document text
    • http://xulezudo.epizy.com/name_tag_design_template_online.pdfIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_4b4c0bf11c514d12979010c71a82d569.pdf?index=trueIn 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_off0000ccae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAE 5296 bytes
SHA-256: 8ace5c1dbaafe4365f656fda713e6ba72f4f1a8aa91802244bb28e779dd7f0e8
font_01_sfnt_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 10020 bytes
SHA-256: 1e03e946ba03cd64e69c006a7220c2e074d3592faf10f8bb424861f31b614282

Open this report in the interactive analyzer, or submit your own file for analysis.