Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3462e613b82652a…

MALICIOUS

PDF

83.9 KB Created: 2021-04-03 17:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2378dec0fc31dd59ef3b52b47a2617a2 SHA-1: 9eb7ca2dcaf2c291781ccdd89617acbc2f502990 SHA-256: a3462e613b82652a65d8fff2b254f856c53e3edd950b7e4f4184e536f82313b4
174 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including random URLs and a link farm on disposable hosting, strongly suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature. The presence of embedded URLs points towards an attempt to redirect the user to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=ninja+unblocked+games+66 PDF link annotation
    • http://nipijapogila.sportsontheweb.net/aprendendo_a_aprender_barbara_oakley_livro.pdfIn PDF document text
    • http://edevletorg.com/jipotaduzubuzimadoby3zwa.pdfIn PDF document text
    • http://dapobapi.22web.org/nuclear_power_plant_operation.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/08hjYhe/the_mummy_returns_streaming_english_full_movie_download.pdfIn PDF document text
    • http://bachanalytics.com/design_patterns_explained_free_downloadxlefr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415748/normal_5ff01ccecf554.pdfIn PDF document text
    • http://fortuneo.biz/the_lottery_summary_short_story0zoup.pdfIn PDF document text
    • http://dezowem.medianewsonline.com/interview_questions_sql.pdfIn PDF document text
    • http://junemam.22web.org/nimoposukezutorilekup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484993/normal_60125f3dc1343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378831/normal_5ff9c8515e8ec.pdfIn PDF document text
    • https://cdn.sqhk.co/pukuwapebo/gZ9iijc/wunenimojif.pdfIn PDF document text
    • https://cdn.sqhk.co/pulizojiwim/jbbgeig/holy_quran_malayalam_translation_audio.pdfIn PDF document text
    • http://kukushpa.fun/can_you_pair_bluetooth_speaker_with_alexak7eyl.pdfIn PDF document text
    • http://operationhomeplate.com/tajosisawelisikefawoxaketcrpxu.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/journey_to_the_west_movie_big_fish.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/yyEgigd/gym_gym_workouts_personal_trainer_bodybuilding.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b880944f-0331-4a00-8767-8a4d1d2e0577/wajakan.pdfIn PDF document text
    • http://safedoguno.onlinewebshop.net/sizotitupulejedazusazarox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f358ed1-dda4-4e49-bd02-fbb0e2328426/how_to_put_thread_on_bobbin_singer_sewing_machine.pdfIn PDF document text
    • http://mawabubobiniz.rf.gd/92707912025.pdfIn PDF document text
    • http://tudosipede.epizy.com/8127206745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a898ed10-e16a-4889-8da5-6473a0d5c5b3/bulopaxuxedosod.pdfIn PDF document text
    • http://xamukipadu.myartsonline.com/2124948778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea3ab83-3f3e-4af2-b9d9-559b6ec0d2d4/himno_nacional_de_honduras_letra_coro_y_solo.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_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 5564 bytes
SHA-256: b5009bb6b89955c24b33a4b351a66cb1905cadcd46dc9f116f5e453fa2bc1789
font_01_sfnt_off00011b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 11336 bytes
SHA-256: c60c05e64122d6827422b3f0228de01b8621e1cdd9de683e1e29a7df9b5b9e3e