Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec71f31f59fd605b…

MALICIOUS

PDF

77.2 KB Created: 2021-04-05 11:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8424ab183705372ae911dfaf02c60466 SHA-1: 8adb432194053ad80dc6cad3dfbb5b2944e72215 SHA-256: ec71f31f59fd605b93c3bbf48a93c28af488b93c74baafd8a875197c0231c89e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=is+orange+juice+better+for+you+than+apple+juice PDF link annotation
    • http://freehookup.xyz/subject_verb_agreement_exercises_with_answerbovpp.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/he_loved_me_lyrics_and_chords3lf0s.pdfIn PDF document text
    • http://strahuemsya.info/xugemuzimiw4h7lv.pdfIn PDF document text
    • http://naturaitalia.space/how_to_add_fractions_with_variables_calculatorunxnq.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/rizuwevize/jicijgr/jizinoxumiguxeli.pdfIn PDF document text
    • http://fashion-deals.xyz/numerical_aptitude_questions_and_answers1xiq2.pdfIn PDF document text
    • http://dayzcommunity.info/4658567275130tlq.pdfIn PDF document text
    • https://cdn.sqhk.co/vumulevezuf/4ghmico/93178066862.pdfIn PDF document text
    • http://you-bestshop.xyz/zijajele9f1e.pdfIn PDF document text
    • http://infonewsuk.site/esame_celi_c16jyld.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/OSgjghg/ancient_egyptian_history_books.pdfIn PDF document text
    • http://bbcua.site/romeo_and_juliet_are_star-crossed_lovers._what_do_you_think_does_this_mean3w51a.pdfIn PDF document text
    • http://avbox.org/bare_knuckle_boxing_uk_sign_upsphf9.pdfIn PDF document text
    • http://afracheat8.xyz/sun_mere_humsafar_female_mp3_downloadrxct1.pdfIn PDF document text
    • http://gooddevice-online.com/96673298989u7wu7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d918782-3155-4897-9896-2699932f6207/running_rich_or_lean_car.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/barevuwufij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453105eb-3d42-495c-8262-b538f56e3363/what_to_do_when_washing_machine_wont_spin.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/krk_rokit_5_g2_spare_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8a12f7-47a0-4339-a47b-3df37e949325/xutexemurinivuza.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/10177523945.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/technical_drawing_definition_in_own_words.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_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 5532 bytes
SHA-256: e9c123ec4edaa7d6149c6d54daec2f2fe12a20aea2beb3239f4f21026f660aed
font_01_sfnt_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 11436 bytes
SHA-256: 1daf40a8dcd7ae39b36c5d69f7c03c80a7222aef6340e4c2813670e05aa3f675

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