Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9978c8e37cf374…

MALICIOUS

PDF

81.4 KB Created: 2021-03-18 13:38:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 483002f60b1a316775bc17ea5e3f8a02 SHA-1: de56556b601c4011da84404af13d7aa993a27961 SHA-256: 1b9978c8e37cf37458c954694ef8b37a461c99e3799ba0f2dee44940949c5c65
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 threat. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, contains text related to GPA calculation, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/aws?utm_term=how+to+calculate+gpa+5+point+scale PDF link annotation
    • https://cdn.sqhk.co/ruzaxube/9gdijek/12479857433.pdfIn PDF document text
    • http://stavki.link/zubibadisafibapokafozono8ct14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425917/normal_600793abe4cbb.pdfIn PDF document text
    • http://fitokapss.xyz/ascertaining_the_three_vowsnwcng.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_6019cb8a57f42.pdfIn PDF document text
    • http://gatorama.fun/36143287040gkrcy.pdfIn PDF document text
    • https://cdn.sqhk.co/nixibaraje/jegcPPE/jumia_black_friday_uganda_2019.pdfIn PDF document text
    • http://negozio50sconto.info/dozogetemubusibikejgwfn.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/hcie77N/53404555996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_6040b18ced8b3.pdfIn PDF document text
    • http://arnautmebel.ru/future_of_life_insurance_distribution15yr3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_60196a143129c.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/Mzig4ig/swat_movie_cast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zodebozagasu.rf.gd/first_grade_addition_worksheets_free_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/47886751537.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/narula.pdfIn PDF document text
    • http://wivonuwexewixir.rf.gd/faterasovubazekejukineped.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/kawaii_anime_wallpaper_hd_for_android.pdfIn PDF document text
    • http://kalilom.epizy.com/convert_to_excel_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/barracuda_spam_firewall_300_admin_guide.pdfIn PDF document text
    • http://xivivafin.rf.gd/celtic_mythology_tales_of_gods_goddesses_and_heroes.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/mass_rmv_crash_report_form.pdfIn PDF document text
    • http://nititagamoba.rf.gd/polaxevip.pdfIn PDF document text
    • http://kutubuge.rf.gd/biaystok_informacje_lokalne.pdfIn PDF document text
    • http://nurifedalezonu.rf.gd/antibiotics_drugs.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_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 5184 bytes
SHA-256: fd58367bcc70fdee6a4bbc796ee6b08cab41b5276021c5163e17272bfba8d422
font_01_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 10916 bytes
SHA-256: dc652e48520aa6b72b3ac077cabcf935114628c38da4adb5869ad0eea0809b50

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