Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bde537c3197f1f7…

MALICIOUS

PDF

72.6 KB Created: 2021-03-01 09:27:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 29603b6e2a89a348f3556c36c06fe191 SHA-1: 20b5b57ab2b4efe7c65a74edeb1398054b570e9b SHA-256: 7bde537c3197f1f79a3ae06c9413972ff62895b173493f97ef3e5f4db2639573
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains text related to 'Overeaters anonymous 12 step book' and application metadata, suggesting a lure to disguise malicious links. The presence of external URIs and the link farm heuristic indicate an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/award?keyword=overeaters+anonymous+12+step+book PDF link annotation
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/xekaburep.pdfIn PDF document text
    • http://lofitner.buzz/kasefebovebajosexuzonmwfk.pdfIn PDF document text
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/ligukapusagixevu.pdfIn PDF document text
    • http://lewodazegozi.iblogger.org/cardcaptor_sakura_wallpaper_hd_free.pdfIn PDF document text
    • http://shopmzm.site/2006_chevy_impala_transmission_replacement_costmzmxl.pdfIn PDF document text
    • http://jewlgems.com/likelafadusilajunr2g8v.pdfIn PDF document text
    • http://fenofojerafama.22web.org/hen_party_game_templates_free.pdfIn PDF document text
    • https://webexopugidoxog.weebly.com/uploads/1/3/4/3/134319438/xemujizuput.pdfIn PDF document text
    • https://cdn.sqhk.co/nawafoxobok/geHhc1R/uber_driver_app_not_working.pdfIn PDF document text
    • http://eeuuurrrrr.space/21060178510tl60k.pdfIn PDF document text
    • https://nupepapeziwib.weebly.com/uploads/1/3/5/3/135319604/nigotapavuk-xogasokej.pdfIn PDF document text
    • http://raxosiwu.22web.org/75381165571.pdfIn PDF document text
    • http://shop-kid-toys.online/camera_lucida_app_for_android_phoneydh5w.pdfIn PDF document text
    • http://stickerrus.ru/ge_over_the_range_microwave_grease_filterdcgzy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/risemimijamur.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/multi_step_equations_worksheet_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/how_to_use_bosch_washing_machine_serie_4.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/nisagoxokolarapazizidod.pdfIn PDF document text
    • http://waxaravibew.epizy.com/mircea_eliade_books.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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 5508 bytes
SHA-256: 2eddb54999a0038514766baca9da4cdf1946bbab86b533c386b4e190105811ed
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 10456 bytes
SHA-256: 75088a65b1525209703a1157c56ca321b7242e2f6f8d9cf0a717f25df5b3d898

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