Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a489a2e56e5b3b…

MALICIOUS

PDF

76.1 KB Created: 2021-02-21 01:08:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c279448981f855dfe8c3ed793986306d SHA-1: d5f77ee18cce56dd9129e2f0a8623bd6f9c198ff SHA-256: 33a489a2e56e5b3bf4c697fcf5ac14709c80435921c444b4a78c1223ae710799
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV signature and an ML classifier. It contains numerous external URIs, many pointing to disposable domains, and is identified as a link farm. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://jottigo.ru/123?utm_term=yo+tu+amor+infiel+letra+la+fiesta PDF link annotation
    • https://wonumizesux.weebly.com/uploads/1/3/4/6/134631676/ranopinimobu-rugot.pdfIn PDF document text
    • https://meruxanige.weebly.com/uploads/1/3/1/6/131636855/f6fc7af916383.pdfIn PDF document text
    • http://neuroncraft.online/vaaste_song_dj_remix316wo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479679/normal_6014d75e55b7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5feaf5e43070a.pdfIn PDF document text
    • http://penaxuwilamufo.iblogger.org/speaker_of_test_failed_android.pdfIn PDF document text
    • http://romeita.space/android_version_8_name_listqiiav.pdfIn PDF document text
    • http://regvoolkim.website/epk_examples_film2cdsn.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/dc0d7ea5668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494435/normal_6013ebea12362.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/nojedasom_josezawiniz.pdfIn PDF document text
    • http://leoidet.xyz/2833142027814s4g.pdfIn PDF document text
    • http://repochka.site/nelirariwuvotxrl2r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guduzexotozi.rf.gd/ponini.pdfIn PDF document text
    • http://majoxokusixapav.epizy.com/55773666204.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/beeware_android_tutorial.pdfIn PDF document text
    • http://luxixeg.epizy.com/12759666893.pdfIn PDF document text
    • http://bigazixipiw.rf.gd/93553890477.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/man_on_the_street_steve_allen.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_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 4876 bytes
SHA-256: db0347a1c14c290dd7a8301e8e4f2c45d94a9ec0d0a33afcefaa463833f83890
font_01_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 12192 bytes
SHA-256: 99857314618149d63b1fa50f817c1aad2db13657dd9357e86ecf68da8c50de4a

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