Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad98625f918fdafc…

MALICIOUS

PDF

85.4 KB Created: 2021-02-27 11:35:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cfb6aec950633da13f348dc7c92703e8 SHA-1: 2b3401eff299e974b2b68835c95dbbc881a08c78 SHA-256: ad98625f918fdafc4a3f3c22ca3cf021d267e3412d2fa4be35c738999e1508d0
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 high likelihood of malicious intent. It contains numerous external URLs, many pointing to disposable domains, suggesting a link farm or phishing infrastructure. The document body, though heavily obfuscated, contains keywords related to practice problems, likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://dugedepap.ru/award?keyword=sat+math+practice+problems+worksheet PDF link annotation
    • http://vizexibidoxi.getenjoyment.net/hp_printer_p2035n_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/ieTlgi3/28785126263.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/black_and_decker_mouse_sander_pads_wickes.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/feXggTP/ravupovirovojopuxi.pdfIn PDF document text
    • https://lexabebuwapo.weebly.com/uploads/1/3/1/3/131383838/214a6a05a2b2b.pdfIn PDF document text
    • http://fabermanufacture.ru/dotted_alphabet_font_freemnxuq.pdfIn PDF document text
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/4991368.pdfIn PDF document text
    • http://remeik.ru/mejinigesuxekon4801.pdfIn PDF document text
    • http://kvyovk.xyz/75274016387oum00.pdfIn PDF document text
    • http://raisinshq.club/gimolusogajujodusexiruzpyymy.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/25847592103.pdfIn PDF document text
    • https://fujemolubese.weebly.com/uploads/1/3/4/0/134012375/nedobepebuso-fujojezezo.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/my_many_colored_days_music_lesson.pdfIn PDF document text
    • http://memisada.mygamesonline.org/2010_chevy_malibu_power_steering_fluid.pdfIn PDF document text
    • https://cdn.sqhk.co/tesosunimew/bCiigTo/febewegekaxebuwakofubajid.pdfIn PDF document text
    • http://itasda.online/videohive_vintage_music_opener_freeoitdw.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/sutawowirosuvuv/brain_games_nat_geo.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/words_that_start_with_z_for_kids.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/wusosum.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/92455335274.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/10781228926.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/razikazubibizexejemavof.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_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 5256 bytes
SHA-256: 4fcfe447cb4d868890d19ca4fdb91914c9eba58ad0147aad7d0e5dffa06c5643
font_01_sfnt_off000115b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B9 10560 bytes
SHA-256: 3623029d6a0cdad4fcd1b80ed4b20ec1afd4dc143dc11460e7b36f099e10aa27
font_02_sfnt_off000139bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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