Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bfc48901c6f51c…

MALICIOUS

PDF

73.4 KB Created: 2021-05-07 18:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6eef2caf75b710b986a4b05faa179b28 SHA-1: 7bd862407c4db5f5e6a6c78bd0bdc1a23a7834f6 SHA-256: 31bfc48901c6f51c63afd46f95a653076955d8518fabf985cd5546e23de679ea
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to search queries, suggesting a lure to a malicious website.

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://ponafet.ru/strik?utm_term=where+can+i+get+ink+cartridges+refilled PDF link annotation
    • http://giocodigital.fun/liwexafajenupomnr8if.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/hSCEiex/luke_bryan_drink_a_beer_memorial_song_lyrics.pdfIn PDF document text
    • http://qlemelest.online/how_to_be_a_toddler_whispererx2cmx.pdfIn PDF document text
    • http://fastcreditreport.info/45971246342m26ww.pdfIn PDF document text
    • http://golosa-spasibo.ru/english_grammar_book_download_for_ssc49aje.pdfIn PDF document text
    • http://alphabitx.com/new_yorker_hotel_nyc_haunted7uy6j.pdfIn PDF document text
    • http://gravkamen.ru/68808132100ww9pa.pdfIn PDF document text
    • http://virnet77.ru/8422096464zy22d.pdfIn PDF document text
    • http://serviceforyou.site/harry_potter_y_el_misterio_del_principe_libro_resumenizhfl.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/ckkia6N/through_the_ages_board_game_rules.pdfIn PDF document text
    • http://trendmobile.ru/pamamuzaxenujewi6n5qh.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/zotiperugi/giTjiSb/extreme_car_driving_simulator_hack_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/lasokixon/hjgC6ii/timmy_s_learning_new_skills.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/aiht2gc/one_night_ultimate_werewolf_daybreak_game.pdfIn PDF document text
    • http://dmdmassage.com/structured_computer_organization_solutions_manualk4htj.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/3d8bf958-c1c7-4236-93ac-f4fd8e7ca673/pakozibefevizezagok.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/allen_major_test_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be0ed111-fb27-4262-8513-a5a14b6e6438/thermodynamics_an_engineering_approach_9th_edition_slader.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/sorarifetil.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/att_informera_och_agitera.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_off0000e1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 5360 bytes
SHA-256: 7ab0d06466d393f1160dbbb0813690c2d7b20ae45ea68b2038dfe70953d2d589
font_01_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 10128 bytes
SHA-256: 74570cd1d97b400b43a73b71d05b92b76e9159a8b3e314b95871adeed998cdfc

Open this report in the interactive analyzer, or submit your own file for analysis.