Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c07eab1a2e4c43…

MALICIOUS

PDF

75.2 KB Created: 2021-02-18 10:45:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 58ba67fab3fa97adbd8814e882a12f2c SHA-1: 4a7e6dcec95d3cf7fea00972031357b2719ea711 SHA-256: c7c07eab1a2e4c43780e0bc77d73e2d197765fd7ee4f4521bdfb7b873cfcad73
186 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=place+value+worksheets+grade+5 PDF link annotation
    • https://cdn.sqhk.co/zubuwebofe/hiWB0HD/66777790698.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/hIdF0UP/81468949115.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/jcOIfAZ/halloween_2020_full_moon.pdfIn PDF document text
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/3404736.pdfIn PDF document text
    • http://labiosdewonda.com/bsc_agriculture_1st_semester_bookss6765.pdfIn PDF document text
    • http://fdvsefwfrw.space/hollywood_movie_hindi_dubbed_download_720p6u068.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/hfidief/derijofanafaropedusato.pdfIn PDF document text
    • https://cdn.sqhk.co/jepogedofuz/hbjfIRJ/89988625089.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/llmhfhb/download_armored_war_mecha_storm_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/jeiepWG/movevuzumupulimuzimap.pdfIn PDF document text
    • http://fitit.space/51722325423rreue.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/icmgjT3/synchrony_bank_amazon_prime_store_card.pdfIn PDF document text
    • https://cdn.sqhk.co/duburijudi/vfAijnr/pinball_gold_rush.pdfIn PDF document text
    • http://salonlabs.xyz/currys_slimline_dishwasher_manualnh3rp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulevufezokul.rf.gd/wokabulutoni.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/canon_t7i_manual.pdfIn PDF document text
    • http://zawemitop.epizy.com/83488775691.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/acer_aspire_5532_disassembly_guide.pdfIn PDF document text
    • http://muzokusadozejog.epizy.com/sideparasowakajafemogi.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/xofodanavabopevuduk.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/feedback_report_format_for_training.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_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 5544 bytes
SHA-256: 26c79f3bc018e43b89c0b9324495a067eb03d4d4cfdd2836f84615d76ed4152b
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 9848 bytes
SHA-256: 46b84ae3230054b2720a9ad2400cca8e4239ac25559428f10dc3621f524d749f

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