Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ae4ea68fffa439…

MALICIOUS

PDF

92.8 KB Created: 2021-04-05 07:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 16f62f3ad30d185a6b1210fb7cf1b094 SHA-1: 368b6b69e64be3645114efe4f9288f59a01ccb93 SHA-256: 97ae4ea68fffa439e1ff57f9f52d12f3e7fb621c142648b0abf2840c49585086
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/wix?keyword=the+importance+of+being+earnest+activity+worksheets PDF link annotation
    • http://erogan-columbia.site/virus_hunter_2020_descargar_uptodown0oqhu.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/a._w._pink_the_attributes_of_god.pdfIn PDF document text
    • https://lowunidedalovel.weebly.com/uploads/1/3/1/3/131380213/9845651.pdfIn PDF document text
    • http://testertumentum.space/information_governance_interview_questions_and_answers9840l.pdfIn PDF document text
    • http://viewcreditscore.info/tabla_periodica_dividida_en_grupos_y_familiasxqbhb.pdfIn PDF document text
    • https://sivajusirev.weebly.com/uploads/1/3/0/8/130814673/314225b.pdfIn PDF document text
    • https://xabejopoturidu.weebly.com/uploads/1/3/4/3/134352457/36a9a23831e39.pdfIn PDF document text
    • https://cdn.sqhk.co/gasajolop/jGSVfja/bleach_immortal_soul_characters.pdfIn PDF document text
    • https://semowonobepak.weebly.com/uploads/1/3/4/2/134235862/rexosig.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/20115137979.pdfIn PDF document text
    • http://instapodarok365.site/tiger_scout_bookb2cr4.pdfIn PDF document text
    • https://vezitiratad.weebly.com/uploads/1/3/1/8/131856143/8564463.pdfIn PDF document text
    • https://kibixaxetoro.weebly.com/uploads/1/3/4/8/134861284/batoguwukewilok-matanaxe-moluboxajikup-wadip.pdfIn PDF document text
    • https://tujezagen.weebly.com/uploads/1/3/4/7/134775207/503286.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/chjGhaV/tisibomobadex.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/jbgdyjf/laser_distance_meter_phone_app.pdfIn PDF document text
    • https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/zomozidagexilawoban.pdfIn PDF document text
    • http://sarhello.online/jotoxesozibobijomiri60tje.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • http://netewe8.xyz/at_the_mountains_of_madness_manga_volume_26fap8.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/42259307518.pdfIn PDF document text
    • http://hotel-engels.ru/dunkin_donuts_jelly_munchkins_ingredients230ph.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/how_to_trade_options_on_td_ameritrade_youtube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijowavatajo.myartsonline.com/craftsman_125_psi_1_hp_3_gal_air_compressor.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_off00012cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD1 5804 bytes
SHA-256: 3d1d68d9d433dd6e52605fa11bf12edf6906cfb9229a1556bedbfa2f712280a6
font_01_sfnt_off0001407e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407E 10868 bytes
SHA-256: beb382a133c17a83819a687e3a97d9688305785c2e5d8e948143a0e43caf572e