Malicious PDF — malware analysis report

Static analysis result for SHA-256 be545ae4118022a0…

MALICIOUS

PDF

77.6 KB Created: 2021-03-17 03:52:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 59f1c71aea2a79a90dcc05a5b08bdeeb SHA-1: 7442ae0036807d7063d83cbb20a81f2ccc21d57b SHA-256: be545ae4118022a0abbc79f44dc7958da75028177e3ab43e9e10d7bf4ca7cdd5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting or link farms, indicating a phishing or SEO spam campaign. The primary lure appears to be a fake driver download for a Dell monitor. ClamAV and ML classifiers strongly indicate maliciousness, and the PDF structure suggests it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://xajibur.ru/strik?utm_term=dell+u2715h+monitor+driver+windows+10 PDF link annotation
    • https://cdn.sqhk.co/zilidadakole/h1QZidL/descriptive_words_list_for_writing.pdfIn PDF document text
    • https://nowuvufeguxebib.weebly.com/uploads/1/3/2/8/132814980/6285473.pdfIn PDF document text
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/xudipudofibuvag.pdfIn PDF document text
    • http://gufutaca6.xyz/22595715011lefrt.pdfIn PDF document text
    • https://sewatebemadog.weebly.com/uploads/1/3/1/1/131164437/dutarege-tuxevidujuwudis.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/nOHgXYl/xogatorowuxububiju.pdfIn PDF document text
    • http://mritzoliver.design/28164221696zs0h1.pdfIn PDF document text
    • http://lami-lashes.site/phd_dissertation_writing_guidevze7i.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/f6ea1bd26c2cbef.pdfIn PDF document text
    • http://muldwych.com/biometric_technology_seminar_reportbk7mj.pdfIn PDF document text
    • http://parrrtner.xyz/infinix_note_9_price_in_pakistan_4gb_ram_128gb_romqpw0h.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/pmAjj9F/power_rangers_legacy_wars_hack_2019.pdfIn PDF document text
    • https://lekipavovat.weebly.com/uploads/1/3/4/3/134332936/8626385.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/eYLzDFC/zazonaxaf.pdfIn PDF document text
    • http://quickstore.pro/miasmas_homeopatia9me55.pdfIn PDF document text
    • https://latuguno.weebly.com/uploads/1/3/1/6/131606113/wuwobaguzimed.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/2465735.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/kjedjfT/average_premium_for_high_deductible_health_insurance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nerugiraxura/4645482427.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/38353052355.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/vuxorukilitimikuwak.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 5420 bytes
SHA-256: 87ca661a0a32ca85e38d961106ca4d9e8bc10481b5e3c8c21c3f111fd73ca7d9
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 10868 bytes
SHA-256: 9488f44c3cd8257c807338aa9d1f85446310bc3412312e3a426821bfae368781
font_02_sfnt_off00011a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A67 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34