Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3615bfefdb9453…

MALICIOUS

PDF

91.9 KB Created: 2021-03-04 05:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a4a9824047943268cb5c82cd06dc77b2 SHA-1: 50dbc50469f4ce0ce8f3f55b15a57fe57dcce3de SHA-256: af3615bfefdb9453678bc151033ebab71c875ba9d54543cbb0780773096bcf76
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, many of which host further PDF files, indicating a link farm or redirection scheme. The document body, though heavily obfuscated, contains a keyword related to 'Biblia reina valera 1960 audio mp3' which likely serves as a lure to attract victims to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://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
    • 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

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