Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ef33f412895f4d…

MALICIOUS

PDF

66.7 KB Created: 2021-03-31 11:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7dcb2ffccf6344d898333c904abb5b83 SHA-1: da486f830eb4ef61f80491c26ab686ce6a35f13e SHA-256: a4ef33f412895f4d6b0ca873cfa7941524dd5a1a427a7dd2a670b1b5765c20be
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 pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=arabiyah+baina+yadaik+pdf PDF link annotation
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://ver-alex.website/76256426131kk5h3.pdfIn PDF document text
    • http://trysoda.club/como_fazer_um_manual_de_instrues_no_word50lf5.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/15025898392mcyk4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466143/normal_5fcfa89719772.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387816/normal_606025cb5555a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489733/normal_6047253fd397e.pdfIn PDF document text
    • http://idealica-italy.site/msvcp140._dll_windows_7_64_bit_free6qlst.pdfIn PDF document text
    • http://lnstagram-office.com/dell_inspiron_1720_price_in_pakistani8bbg.pdfIn PDF document text
    • http://takipleskazan.org/selugawowui8ye4.pdfIn PDF document text
    • http://wobepatonogez.iblogger.org/afrobeats_instrumental_2018.pdfIn PDF document text
    • http://deemonatrafik.xyz/whirlpool_duet_washing_machine_control_panel64ayk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_6045e87918bc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_5f7e2a0004484cedaf52fde228c7e79b.pdf?index=trueIn PDF document text
    • http://wapukum.epizy.com/kafujotonejugirifogufab.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_0b8f800bba0445249402b472225a5078.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_off0000c855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC855 5212 bytes
SHA-256: 31d7c661450b9131f1ed7a3cccafa9e28ebbb579b09c456b8a6202b364fe3cbb
font_01_sfnt_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 10228 bytes
SHA-256: 203534883509161042320490aa18c95bf09c0d37d18e6f672f7e98683e0149f4

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