Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af93dc13d585d95…

MALICIOUS

PDF

74.0 KB Created: 2021-01-31 00:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 21f9ce780f4a91fea424df0dab265288 SHA-1: e31d3930f3e927f33d2dc9d46b02decbf030aace SHA-256: 1af93dc13d585d95e6864fcbe8a0499959098cc0ab122757fcbdef7e0750a1f4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/123?utm_term=school+girl+outfit+splatoon+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469103/normal_6010f3b94c21a.pdfIn PDF document text
    • https://pidilamobojuri.weebly.com/uploads/1/3/5/3/135310388/nulodugafazi.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/0c9ae29e.pdfIn PDF document text
    • https://pimuvetu.weebly.com/uploads/1/3/4/6/134635596/2021479.pdfIn PDF document text
    • http://ladunalufim.iblogger.org/nice_guidelines_anticoagulation_stroke.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/e2Sgiij/wizard_of_oz_witch_costume.pdfIn PDF document text
    • http://copyright-securityx.com/lezaneguxoxdsx9w.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/jjjihar/watch_neighbors_2_free_online_streaming.pdfIn PDF document text
    • http://iclod.tech/70167972224f2hc3.pdfIn PDF document text
    • http://eroganoficial.site/15572520250yeu0a.pdfIn PDF document text
    • http://taxiditugivubed.iblogger.org/wexuvuzotuzotenarisokaba.pdfIn PDF document text
    • https://cdn.sqhk.co/pinufizugal/fjeLby2/11432541127.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/gjNS9tA/goodreads_best_books_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/sivefuxonix/gggWiie/applicable_law_business_dictionary.pdfIn PDF document text
    • http://geesecam.com/68670306838shx81.pdfIn PDF document text
    • https://cdn.sqhk.co/vusanutoj/cjjjigd/pekawuxe.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/tozijezomuxededubo.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/kkhglex/classical_piano_songs_for_beginners.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://renawexit.epizy.com/c_sharp_oops_interview_questions_and_answers.pdfIn PDF document text
    • http://zumaborelap.rf.gd/agent_a_apk_data.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_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 5512 bytes
SHA-256: 7e6af1c80cf88458f808457d721e4009a68ed44d4d62ed1fb9c47a378cec976e
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 11356 bytes
SHA-256: f4e5b843cfb61959b8e8640adc63190f8228c803e2b5d20c065815ee36266e6d