Malicious PDF — malware analysis report

Static analysis result for SHA-256 134036fde3e9f296…

MALICIOUS

PDF

74.5 KB Created: 2021-04-28 12:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: b34c2e4a77668c74013067ca2db6b375 SHA-1: f85fd8751a2e6eaceee40d610da3a30f5eb12c96 SHA-256: 134036fde3e9f2961cfd1079c7c24ca0275baa809081b506f98e864e8d434408
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 of which are hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to a search query. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=what+is+the+code+for+insignia+for+comcast+tv+remote PDF link annotation
    • http://remastacer.com/badminton_footwork_techniques1qqh4.pdfIn PDF document text
    • https://xujajogasugoni.weebly.com/uploads/1/3/4/5/134514057/8501.pdfIn PDF document text
    • http://ctyr.ru/224753320055w2tg.pdfIn PDF document text
    • https://jewutejaj.weebly.com/uploads/1/3/1/0/131070173/kogud.pdfIn PDF document text
    • https://gepekipaw.weebly.com/uploads/1/3/5/3/135304147/9785859.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/accord_piano_jazz.pdfIn PDF document text
    • https://juzatimeb.weebly.com/uploads/1/3/4/6/134605854/37d86a2e.pdfIn PDF document text
    • http://pikegupima.medianewsonline.com/kulagobezib.pdfIn PDF document text
    • http://xbet1.fun/687876285408elnn.pdfIn PDF document text
    • https://gitaxawisar.weebly.com/uploads/1/3/2/8/132814742/woxiwes.pdfIn PDF document text
    • http://kpupnov.pro/plantronics_s12_replacement_ear_cushiony1zkz.pdfIn PDF document text
    • https://galuxenezinex.weebly.com/uploads/1/3/4/4/134437763/penatataz.pdfIn PDF document text
    • http://my-favshopc.online/quantifiers_grammar_worksheetkcqwl.pdfIn PDF document text
    • https://wupixizot.weebly.com/uploads/1/3/5/3/135398135/60123.pdfIn PDF document text
    • http://girepodemaz.getenjoyment.net/how_do_you_start_a_flooded_snowblower_engine.pdfIn PDF document text
    • https://pilopagitek.weebly.com/uploads/1/3/4/8/134856928/fulapenelovotiz-zipizafu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_2079e2936719409c9fd070d865ecb88d.pdf?index=trueIn PDF document text
    • http://madepadejatutof.onlinewebshop.net/33230854951.pdfIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_96f8ce6b360c40728e5a956a0aab7568.pdf?index=trueIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_3241755698514cbaa5a584d8a2262628.pdf?index=trueIn PDF document text
    • http://sarutufasiko.atwebpages.com/ditelow.pdfIn PDF document text
    • http://noxumalog.onlinewebshop.net/algology_textbook.pdfIn PDF document text
    • http://gubawakelu.onlinewebshop.net/poxoxinozo.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_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 5476 bytes
SHA-256: c0721bd5eba6caf0ddb9c83282091e3987caa197268ba74f586b48b0c084b584
font_01_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 10304 bytes
SHA-256: beb1fb59bc6d535141b1a727a9f7a97f8493254cb0ca559722dc25da36c2a8f3