Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71d1fbbb8c3ae7e…

MALICIOUS

PDF

78.6 KB Created: 2021-03-17 10:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 18d90e462e5808df4f891829e5d042ba SHA-1: e63a13fa3a2a5c860d6a60bdce1a62c0986c7e0b SHA-256: b71d1fbbb8c3ae7eddbe15c1fc0a674f91b30e74eda3f9f2876bb8371773764f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URL `https://jacksth.ru/award?keyword=similes+and+metaphors+worksheet+pdf` suggests a lure to a phishing or malware distribution site. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing attempts.

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://jacksth.ru/award?keyword=similes+and+metaphors+worksheet+pdf PDF link annotation
    • http://sallehq.xyz/wexifikodexetubepazinoqyn.pdfIn PDF document text
    • https://cdn.sqhk.co/ditutafewaw/NNHhije/toca_nature_game_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dubagojovo/8Kqhbgf/sniper_ops_3d_shooting_game_download.pdfIn PDF document text
    • http://reflectionss.space/anther_s_ladder_melee_netplay_guide4p7gm.pdfIn PDF document text
    • http://onlinesos.tech/692255702578017m.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/f7jfHSz/marxist_leninist_party_of_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/zajagatetode/afhgKNX/marvel_retro_6-_inch_collection_spider-_man_figure.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/ggcDShi/car_driver_4_hard_parking_hile_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xivixevowiwawe.rf.gd/94829403669.pdfIn PDF document text
    • http://gajedimigifupet.epizy.com/gotepozador.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/can_a_derringer_kill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0369ed8-4009-4b22-b583-1a04cff446c5/pisubogomi.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/458471169.pdfIn PDF document text
    • http://rutemosij.epizy.com/cute_weekly_schedule_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e59f3c2b-0c05-4dc4-8d86-0ae0aad958b2/can_you_track_a_usps_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d835b6-6a97-410d-9985-3689fa0dba85/24947761678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd939e6-14dd-4a82-9d2e-3c67f5a54f22/the_invalids_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac48454-1813-4b21-9b2c-2391f1740b82/como_agua_para_chocolate_english_translation_chapter_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d3b6d0-29f4-474c-972b-84e19766c158/66528281051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1722128d-19be-4c09-a9f8-24c8523911e1/my_lg_washing_machine_door_wont_open.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93495691-e842-4dcd-9b4f-f59587993b00/macbeth_modern_english_act_4_scene_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a5c4c4-112d-47db-9634-7af1fb21c4af/kodexelu.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_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 5540 bytes
SHA-256: 45aa205e081d2ba97b527ced62f8b128ba07289fa64358d8866d2073540d83e1
font_01_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 10732 bytes
SHA-256: a5c783958843a47f6726e131d112917234814ef800b36834991b37f8b43ad25c

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