Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d4c3be24e94ebd…

MALICIOUS

PDF

73.6 KB Created: 2021-02-21 00:35:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3005ebceede778352340387d99c3c6a SHA-1: 14131238ec5bd20cab49560dc3cf271e985603b4 SHA-256: c1d4c3be24e94ebd5dd75c8cfbaac80721ebd40d7863ea4155e4715665cd9eea
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains embedded URLs, one of which, https://seumenha.ru/strik?utm_term=brother+mfc-j825dw+printer+won%2527t+print+black, appears to be a redirector for a malicious campaign. The document body, though heavily garbled, contains text related to printer issues, likely a lure to encourage clicks on the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=brother+mfc-j825dw+printer+won%2527t+print+black
    • https://cdn-cms.f-static.net/uploads/4457332/normal_602b71dd495b0.pdf
    • http://future-techno.ru/89947786536m8foo.pdf
    • http://legalvictory.group/35486738533hv8wm.pdf
    • http://formblckr1.xyz/the_hitmans_bodyguard_online_free1bihl.pdf
    • http://ryukzak.digital/one_talk_application2lyg7.pdf
    • http://ganexofom.iblogger.org/linear_guide_roller.pdf
    • http://vabazaf.22web.org/android_apps_on_win_10_phone.pdf
    • https://static.s123-cdn-static.com/uploads/4453575/normal_5ff40f66e6444.pdf
    • https://vimasavugaf.weebly.com/uploads/1/3/4/5/134587410/b9985b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kevowuju.rf.gd/news_intro_after_effects_templates.pdf
    • http://gazosaka.epizy.com/video_er_extension_chrome_free.pdf
    • http://wogekipa.rf.gd/american_boy_estelle_piano_sheet_music.pdf
    • http://melubofagediw.rf.gd/monophone_automatic_electric_company_chicago.pdf
    • http://manovubiludigi.rf.gd/sasuxetewepewepodigivar.pdf
    • http://tukemujixoku.rf.gd/palm_reading_guide_short_life_line.pdf
    • http://pakafadudu.epizy.com/xewemugosonig.pdf
    • http://vesebebiwimana.epizy.com/xejipigoronobu.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_off0000e13f.bin
b7bd9052b36f8454509a25f5f6700a1ccbe341db70f80542b18448c9ab8c4f93
pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 6156 bytes
font_01_sfnt_off0000f634.bin
8e2305318de5f600dfc6ca641bb7eaad768864499f9292b9f5be77dd549ff317
pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 10048 bytes