Malicious PDF — malware analysis report

Static analysis result for SHA-256 28724b0f8ea0bb13…

MALICIOUS

PDF

107.6 KB Created: 2021-04-20 16:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7e1a1c0955a35c9b26832e413346b23c SHA-1: 9f2596d5e8b98cd1ebc094fc044e88e0c95c363a SHA-256: 28724b0f8ea0bb138da0fb9306711134d9c4f62fff9fe07da5f5dcb50cef3632
106 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or spam campaign. The ML classifier strongly indicates maliciousness, and the presence of a URL with a 'utm_term' parameter implies a tracking mechanism often used in phishing lures. No scripts were extracted, but the document's structure and URL distribution are indicative of a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://vilenefex.ru/strik?utm_term=why+isn%2527t+my+hotspot+working+t+mobile PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374374/normal_604ce9bc5068c.pdfIn PDF document text
    • https://balabirow.weebly.com/uploads/1/3/4/6/134690292/lobasad_volafi_dotezaxujib.pdfIn PDF document text
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/gijujujoma-sowabam-vudipifa.pdfIn PDF document text
    • https://beginuvemosuso.weebly.com/uploads/1/3/4/6/134699988/a49a3.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/jfjiVVw/expanse_meaning_in_bengali.pdfIn PDF document text
    • https://vovavurag.weebly.com/uploads/1/3/0/7/130739927/lepirarisu.pdfIn PDF document text
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/fowepo_polesunabagi_sugotamezaduki_janudisog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5feb795a98f1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470412/normal_5ff19bc82dc5b.pdfIn PDF document text
    • https://cdn.sqhk.co/kulamogo/efBidgc/raceroom_racing_experience_track_list.pdfIn PDF document text
    • https://gujejitemisadud.weebly.com/uploads/1/3/4/3/134354005/c35ef7c8.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/kiaJUDV/electronic_music_maker_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/ihg6jed/swat_and_zombie_season_2_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/aDxjchb/vegan_hamburger_buns_nutritional_information.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471513/normal_5ff66a04aac6b.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4421615/normal_603c02365a872.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/8031970.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/miruserojajaki-xifesol.pdfIn PDF document text
    • http://dudoguxu.22web.org/adverbs_of_frequency_in_negative_sentences.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/aDxjchb/In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bulalowisu/nokiwawitonatolapozed.pdfIn PDF document text
    • http://bifipibedulewu.epizy.com/engineering_mathematics_1_syllabus_anna_university_regulation_2013.pdfIn PDF document text
    • http://gejagixuz.epizy.com/pdf_to_word_converter_apk4fun.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/how_to_make_naturally_curly_hair_at_home.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/goluso.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/empirical_antibiotic_therapy_guidelines_india.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/was_jekyll_and_hyde_real.pdfIn PDF document text
    • http://mitadur.epizy.com/robibotefotivexedewenoduv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001555f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555F 5256 bytes
SHA-256: 31f60e0ab0792dcc7537ae53da9bb9a1b39f55127f82100b73dda2006ec6928c
font_01_sfnt_off0001672b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1672B 12336 bytes
SHA-256: 36a280fe2fc7480998e28f37b66324dd2956ee884c5cb756d2598979d1fc9c09
font_02_sfnt_off000190b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190B5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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