Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c136f5f1948832…

MALICIOUS

PDF

78.2 KB Created: 2021-03-22 00:25:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df322dfb245134cda4427cfe3b8b0bbc SHA-1: ef7dd9824e1329ffa9c3d1ddf7634a96794b876a SHA-256: 05c136f5f19488321fac312092df28a3bd1cce3621405d3f88a93e0eb87e6ba2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains embedded URLs and heuristics indicate it is part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to a song ringtone, which serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nipisod.ru/123?utm_term=aradhike+song+flute+ringtone
    • http://lightsex.ru/tabefezotonepisodexosk67z3.pdf
    • http://nutapobo.iblogger.org/gixabufenikefitudilomu.pdf
    • http://tryse.xyz/26810252937dkpuo.pdf
    • http://femusawar.iblogger.org/83267155481.pdf
    • https://cdn.sqhk.co/bipozipo/idofHhf/best_children_s_movies_on_amazon_prime.pdf
    • https://cdn.sqhk.co/tikugosedik/5gieTgf/mechanical_engineering_technology_careers.pdf
    • http://lexanizisujufum.66ghz.com/15500188220.pdf
    • https://cdn-cms.f-static.net/uploads/4366350/normal_602105b0e351d.pdf
    • http://technodom11.com/dallas_fort_worth_weather_allergy_reportewh5d.pdf
    • http://nazhivy.net/988963308747bsnz.pdf
    • http://cabinetshq.xyz/secrets_of_underground_medicine_book_review8vhau.pdf
    • https://cdn-cms.f-static.net/uploads/4365608/normal_601cbd00624c6.pdf
    • http://pejofewetoz.22web.org/2090553188.pdf
    • https://cdn.sqhk.co/fabozesemi/hhbhiif/ibs_and_sour_stomach.pdf
    • http://borezopesane.22web.org/68678309433.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://komopojanali.rf.gd/62810950421.pdf
    • http://rusilip.rf.gd/82124265087.pdf
    • http://wamajagi.epizy.com/bactrias_biologia.pdf
    • http://vapovalexuma.epizy.com/fodajoresovizor.pdf
    • http://tizelimanux.rf.gd/how_much_do_first_year_teachers_make_in_texas.pdf
    • http://xewenofos.epizy.com/xezavedotenesataraz.pdf
    • http://sobumewupuvuve.epizy.com/93010284921.pdf
    • http://xixujoteb.epizy.com/54991234007.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f564.bin
67145fd0ecfcc00acc7307b01f4171baca72460c144e5583519d8b4d8242b1f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 5220 bytes
font_01_sfnt_off00010722.bin
d993814901539e0c52ef6fa7f84c62605efed49343ed4baafc66be4a74ca0060		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 10608 bytes

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