Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56ed588e234c744…

MALICIOUS

PDF

68.9 KB Created: 2021-01-20 06:59:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 16c4f8821e7cc3868f6a0c019d396478 SHA-1: 7ec41d4ddccc6eac87f4e1785bb4acab6af84686 SHA-256: d56ed588e234c74478206c1799dcc3b602554832723364efbaf67dbbaa767689
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to educational materials, which is a common tactic for phishing or malware distribution. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to potentially harmful sites.

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://trafftec.ru/123?utm_term=beginning+and+intermediate+algebra+with+power+learning+4th+edition+answers PDF link annotation
    • https://site-1181045.mozfiles.com/files/1181045/zendesk_guided_mode.pdfIn PDF document text
    • https://site-1210646.mozfiles.com/files/1210646/tamosipov.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/579b1.pdfIn PDF document text
    • https://pexevirojaloko.weebly.com/uploads/1/3/4/8/134882405/sudokiwifares-mukaxuj-jisiweju.pdfIn PDF document text
    • https://vizifota.weebly.com/uploads/1/3/0/9/130969876/80cf13baf042c.pdfIn PDF document text
    • https://site-1177540.mozfiles.com/files/1177540/elements_financial_credit_union_mortgage_rates.pdfIn PDF document text
    • https://falaxejuwutop.weebly.com/uploads/1/3/2/6/132681153/5397001.pdfIn PDF document text
    • https://wovufimi.weebly.com/uploads/1/3/5/3/135327312/98f6e9c5a.pdfIn PDF document text
    • https://site-1186874.mozfiles.com/files/1186874/enable_if_vs_template_specialization.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pasivete.epizy.com/79711651424.pdfIn PDF document text
    • http://fiwabafedazuv.epizy.com/angry_birds_star_wars_full_movie.pdfIn PDF document text
    • http://fuvituze.epizy.com/algorithmic_music.pdfIn PDF document text
    • http://femodizabofowu.epizy.com/nizeju.pdfIn PDF document text
    • http://wanudoxemix.epizy.com/xusuvozakukunufolubagexij.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/rigunexepudiru.pdfIn PDF document text
    • http://tafikepuvanotu.epizy.com/automotive_spice_guidelines_1st_edition_2017.pdfIn PDF document text
    • http://kujafugakare.epizy.com/nitogebefagolelodipexato.pdfIn PDF document text
    • http://mexesumofiruvaf.rf.gd/weather_report_in_hyderabad_pakistan.pdfIn PDF document text
    • http://favekagopu.epizy.com/shinee_good_evening_song_ilkpop.pdfIn PDF document text
    • http://losisotudek.epizy.com/fuzamus.pdfIn PDF document text
    • http://zelixedamaxux.rf.gd/biodiversity_and_conservation_book.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_off0000cd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1A 5744 bytes
SHA-256: ef21c9c6d0e85f601421b676b3cc5bf3a4ff7e77cd7646bff229025f8a8e0c97
font_01_sfnt_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 10900 bytes
SHA-256: ddb1f7c4e7b571adcb75c88f8fbf2a75078e745c73f11c18663a39b7d10b2d33

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