Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb921afa7fff3af…

MALICIOUS

PDF

75.4 KB Created: 2021-01-19 16:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5d686c4526644fa965839625ceb46c88 SHA-1: 96c23b3cce6be81a6262660f44c914ab8aeeb5f8 SHA-256: 5eb921afa7fff3afc7418a8e5d6894d248f6e640fb505cbb9c0bc794b5a09f2b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

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://traffset.ru/123?utm_term=mini+chopper+parts PDF link annotation
    • https://cdn.sqhk.co/wediximewoza/eQhfkgj/kovasuxubalomikazupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5fdb30c6bb90d.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/gsibijr/pizudivizenowoxekenafexu.pdfIn PDF document text
    • https://site-1172843.mozfiles.com/files/1172843/58217598953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410695/normal_5f9e08428b954.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454052/normal_5fcb2d4a6178a.pdfIn PDF document text
    • https://site-1187178.mozfiles.com/files/1187178/centipede_venom_dogs.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/dhapjjV/fexogupolifegebugupa.pdfIn PDF document text
    • https://site-1172574.mozfiles.com/files/1172574/37659741411.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/YziaBha/musakuwokigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392871/normal_5fdac29bbb4bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vunizi/psoriasis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/zendesk_chat_api_android.pdfIn PDF document text
    • http://sumojoripira.rf.gd/65281266496.pdfIn PDF document text
    • http://wexugemo.epizy.com/diffusion_and_osmosis_challenge_worksheet_answers.pdfIn PDF document text
    • http://lavuradisaxel.epizy.com/42518316289.pdfIn PDF document text
    • http://pamiwumewamem.epizy.com/lokibogup.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_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 4996 bytes
SHA-256: 0fe8a5cdfe810b26109f5fafeac3a8ee218c7eb5bd033a60cb1c4e13118b8c34
font_01_sfnt_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 10792 bytes
SHA-256: cb9ecdf0dac0ed4b05eedd462083d448d98e3e90818ab33be5b0d98ce16dd8db

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