Malicious PDF — malware analysis report

Static analysis result for SHA-256 3714b727cdd8a9ba…

MALICIOUS

PDF

87.3 KB Created: 2021-02-11 02:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0246104c7f64f98cdddbadbef8568614 SHA-1: 4395fd85cfd8d48cd0774116d8372509f8b6bb1a SHA-256: 3714b727cdd8a9ba632daeeb500fd39f6a05e952224c7903f89eb54957060038
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of these URLs and the overall structure strongly suggest an attempt to trick users into downloading further malicious content, likely disguised as a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=star+wars+special+modifications+pdf+download PDF link annotation
    • http://zuvels.xyz/pajitirajisamotikatinusag6cpc.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/4424362.pdfIn PDF document text
    • http://ital-girl.space/cabal_mobile_apk_latestketrz.pdfIn PDF document text
    • https://mamudige.weebly.com/uploads/1/3/0/8/130874639/3aec55f710961.pdfIn PDF document text
    • http://tehnotop.space/android_file_transfer_not_working_galaxy_s6st2b3.pdfIn PDF document text
    • http://hiziryigit.online/414931393709s4t2.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/kipapige3g256.pdfIn PDF document text
    • https://muwewemumefiga.weebly.com/uploads/1/3/0/8/130874681/9134942.pdfIn PDF document text
    • http://fruitnaturs.space/where_can_i_watch_jersey_shore_season_3_online_for_freecafct.pdfIn PDF document text
    • http://ighelperscenter.com/kakuterowidibexezunen9xlzx.pdfIn PDF document text
    • https://jimedugevebuz.weebly.com/uploads/1/3/4/4/134437071/moxini_lonigoxet_faxosera.pdfIn PDF document text
    • http://shop50off.info/189914902835la2b.pdfIn PDF document text
    • http://dutov.org/natal_chart_transit_report_freeh5ylm.pdfIn PDF document text
    • http://digitaloffice24.ru/topelopezovasot5vark.pdfIn PDF document text
    • http://vorecan.fun/xirugojabozufajij2z1x.pdfIn PDF document text
    • http://piwafudenipaluw.66ghz.com/compensation_offer_letter_template.pdfIn PDF document text
    • http://begemotiks.space/jejojujuga10f0o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luremanoxe.epizy.com/65810002682.pdfIn PDF document text
    • http://gedikoti.epizy.com/hyperboloid_of_two_sheets.pdfIn PDF document text
    • http://tuvojiteziw.epizy.com/mayabazar_film_songs.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_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 3688 bytes
SHA-256: b6c25737f85906ed0fe131e53998c2e13d514042c2e123bdaf77ebf327642e1e
font_01_sfnt_off000115b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 5496 bytes
SHA-256: 762e767afb0a489e54a042240a3cd2dd1314b912dda3d9c747535619b0c9149a
font_02_sfnt_off00012865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12865 11644 bytes
SHA-256: 68b7ac3a5e40757a97a3eb3956a3ea212dcf46a9927b480f3fb0f3f41d6dc0d3

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