Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c5a734ddc0d80b…

MALICIOUS

PDF

91.4 KB Created: 2021-02-27 09:33:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1bda4e7dac926897abb66898e4aa6818 SHA-1: b5e31ca4c8a372323b3808bc653492573330691f SHA-256: a1c5a734ddc0d80b29a1abec7d1ac9603c937e0f5a65fffbea019a0a98ce841c
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, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to kinetic energy and authoring application details, which are likely decoys.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/123?utm_term=kinetic+energy+depends+on+an+object%2527s+mass+and+velocity PDF link annotation
    • http://helplnstagramcontact6088758.com/lezamilexumazadamuy55.pdfIn PDF document text
    • http://renijulemigato.iblogger.org/top_multiplayer_chess_apps_android.pdfIn PDF document text
    • http://chategratis.online/ivms_4200_manual_espaoln0td4.pdfIn PDF document text
    • http://govnososal.xyz/the_highwayman_cyberpunk_authorization_not_foundxxzae.pdfIn PDF document text
    • https://mizunemaki.weebly.com/uploads/1/3/4/8/134850414/9321440.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/graco_my_ride_65_recall.pdfIn PDF document text
    • http://rp-youtube.fun/target_shooting_archery_equipmentu2ykd.pdfIn PDF document text
    • https://gizizajavime.weebly.com/uploads/1/3/2/6/132695742/zegole_gejovofitoki_babogosu_nasixovoj.pdfIn PDF document text
    • http://nosinoski.shop/jiredogibevebeliwnqun.pdfIn PDF document text
    • http://flash-sar.online/ribepiponulalepatulom8y8l8.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/can_i_add_a_jitterbug_to_my_verizon_plan.pdfIn PDF document text
    • 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
    • http://zuputes.atwebpages.com/tubeverudofabegeber.pdfIn PDF document text
    • http://xuneviwek.epizy.com/suradibafuluges.pdfIn PDF document text
    • http://tinasixubu.epizy.com/11691994699.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/virusowogojuzulejo.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/77059264432.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/ninafobifeba.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/casio_g-shock_g-9000-1vdr.pdfIn PDF document text
    • http://wowimiberosodav.epizy.com/6682853999.pdfIn PDF document text
    • http://kunerev.epizy.com/tutavijafivigadatujobit.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/9403726141.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 5564 bytes
SHA-256: d8cd47b565a7b3637d2487fddf490a3570342cf186877cf319b908742b37778e
font_01_sfnt_off000110fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FE 12760 bytes
SHA-256: caf6dc76ee87efc4fd99390d386de88bcc08d7292e7b7f9f21479e54dd98d10d
font_02_sfnt_off00013c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C90 16108 bytes
SHA-256: 81bda41518579e157c5ba17c7abed1d1e9aaa7bb18dcd2fd6bea2870717186b1
font_03_sfnt_off0001514a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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