Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1502b5a29bf498f…

MALICIOUS

PDF

78.4 KB Created: 2021-02-25 18:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2638bed81d34b10139d6eecbe22e96c0 SHA-1: 9ca4dce370f15aed551e149e18cc90e695ab0ebd SHA-256: a1502b5a29bf498fe94376d21f3d18fb4e6d318103499640508d569081e9e03e
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, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure, possibly disguised as a user manual, to encourage clicks on these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wb?keyword=mfj-949e%20user%20manual PDF link annotation
    • http://punejew.mygamesonline.org/what_are_good_core_exercises_for_seniors.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/17622175618xbj4o.pdfIn PDF document text
    • http://mavitrade.com/sigil_magic_in_hindiqbcr7.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/how_to_change_nutone_light_bulb.pdfIn PDF document text
    • http://velesvoyage.ru/driver_booster_4._4_license_key5efev.pdfIn PDF document text
    • http://mir23.xyz/50958747413eqyqs.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/dd_3.5_e_monsters.pdfIn PDF document text
    • http://istlan.space/41533694238pmoso.pdfIn PDF document text
    • http://construt.site/falling_kung_fu_master_arcadeee32w.pdfIn PDF document text
    • http://sushibara.net/icis_heren_nel_report_esgm1xlov.pdfIn PDF document text
    • http://ecoterritory.store/swing_flyer_rideod8ch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tivogowajap.epizy.com/54060384441.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/jump_force_next_dlc_characters.pdfIn PDF document text
    • http://kafudunafow.epizy.com/naxuvokonibijagibakolu.pdfIn PDF document text
    • http://fonojuw.epizy.com/basic_computer_science_interview_questions.pdfIn PDF document text
    • http://xifonefoje.epizy.com/xiaomi_camera_apk.pdfIn PDF document text
    • http://pidawuz.epizy.com/american_society_of_plastic_surgeons_annual_meeting_2020.pdfIn PDF document text
    • http://fabibobitobabo.epizy.com/how_to_get_a_good_workout_on_a_recumbent_bike.pdfIn PDF document text
    • http://mafodif.epizy.com/mozaluv.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_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 5272 bytes
SHA-256: b5650aada4c053b8a944e466f610456328371a558ba6e079fdf45730d7a1f55b
font_01_sfnt_off00010631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 11568 bytes
SHA-256: 599837562e213085cb0e2abe8f6ada5f1a660f4bafa1a286837cc1ad0fc677dc

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