Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f0c81b7d566757…

MALICIOUS

PDF

91.1 KB Created: 2021-03-04 05:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4c4f4f150b3e71d1cddd1fd19e1cf040 SHA-1: 5cf1395f805f89e40830374b3bfc199446103a35 SHA-256: b8f0c81b7d566757249f7008dbac6b5ba20ccdceffa9a2f030ed7321585511e6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://botokaw.ru/award?keyword=biblia+reina+valera+1960+audio+mp3 PDF link annotation
    • http://wide-take.top/napilizapbbb73.pdfIn PDF document text
    • http://getsol.xyz/livesumtqy.pdfIn PDF document text
    • http://changely.club/calculus_1_review_problemsx5c4i.pdfIn PDF document text
    • http://my-favshopd.online/whirlpool_commercial_water_dispenser_water_coolerpgqc3.pdfIn PDF document text
    • http://eushopvmn.site/29385109676ss03v.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/is_the_great_debaters_a_true_story.pdfIn PDF document text
    • https://sezijaxafiv.weebly.com/uploads/1/3/1/6/131637080/42dac7bfdab97.pdfIn PDF document text
    • http://abistrans.ru/best_free_sat_prep_coursepam8h.pdfIn PDF document text
    • http://shop50off.info/aiou_assignment_cover_pagehnfdh.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/55354034464.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/jason_and_the_argonauts_book_3.pdfIn PDF document text
    • http://1xbet-football.fun/zozezafematibafi2cysb.pdfIn PDF document text
    • https://karinavoru.weebly.com/uploads/1/3/4/0/134017817/muvegejadisez.pdfIn PDF document text
    • https://getezulesu.weebly.com/uploads/1/3/1/0/131071231/9c8a39472.pdfIn PDF document text
    • http://1xbet-registrat.site/speer_reloading_book36i30.pdfIn PDF document text
    • https://dodilepu.weebly.com/uploads/1/3/4/4/134444379/wudosopesawobunutud.pdfIn PDF document text
    • http://kupivse.xyz/can_a_trickle_charger_be_used_as_a_battery_tenderxfnc3.pdfIn PDF document text
    • http://usene.xyz/xupedubaxupazn3.pdfIn PDF document text
    • https://xoruvuxana.weebly.com/uploads/1/3/2/6/132696063/totewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzuxutetug.atwebpages.com/mudedajefonon.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001151c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 5844 bytes
SHA-256: 54b2e025751b47a7d99d307d24dd884ac294756d028119189e3e4a4ee8fe0bba
font_01_sfnt_off000128ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EA 10492 bytes
SHA-256: 4a12b7f382b9efbb5fca2236b80430438b880b0a5c5ea58a8e52bf1a7e61a45f
font_02_sfnt_off00014cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFB 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

Open this report in the interactive analyzer, or submit your own file for analysis.