Malicious PDF — malware analysis report

Static analysis result for SHA-256 37dbe0a1afdd2c9b…

MALICIOUS

PDF

80.5 KB Created: 2021-04-01 09:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 33de3aef91ff1183d6505af07eb4e285 SHA-1: e8a87950f3afbb747dafb040e7c8832a2a29c340 SHA-256: 37dbe0a1afdd2c9b879cc48457716bdb83903e6b2e93ae7d973a96f297168256
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and a phishing/malicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a printable calendar, which is then used to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/award?keyword=printable+calendar+pdf+october+2020 PDF link annotation
    • http://tekufebuxu.iblogger.org/cessna_182_parts_manual_free.pdfIn PDF document text
    • http://you-bestshop.xyz/weight_lifting_classes_for_beginners_near_mefaba6.pdfIn PDF document text
    • http://buledumemo.iblogger.org/alpha_male_strategies.pdfIn PDF document text
    • http://whitetwo.space/killing_floor_2_xbox_one_updateiu1km.pdfIn PDF document text
    • http://cardioactiveuficiale.site/does_autozone_do_transmission_fluid_changey36yf.pdfIn PDF document text
    • http://barbanapoli.moscow/ecsa_candidate_application_form11137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451035/normal_6033a2fc5ec93.pdfIn PDF document text
    • http://kprovk.xyz/6611200044814ynt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420903/normal_5fdd3a85ac760.pdfIn PDF document text
    • http://nomegejevo.22web.org/gorumosizajixek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485313/normal_5fca89df96de8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420775/normal_5fe25dd987dbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375351/normal_5ff5f8e68ea0e.pdfIn PDF document text
    • http://vipmanmarket.space/how_to_use_a_honda_gcv190_pressure_washerf2ell.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_6034953ecaebb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413966/normal_60089ac0cffc1.pdfIn PDF document text
    • http://zavodtriumf.com/south_west_gauteng_college_application_form_2020hq45b.pdfIn PDF document text
    • http://webdefilmizle.com/cricket_live_match_app_downloadriupz.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/9c661b3d-12c1-43aa-8acd-9eab51bf81d3/laboratory_manual_for_principles_of_general_chemistry_10th_edition_answer_key.pdfIn PDF document text
    • http://relimimukavewuj.rf.gd/dowilozujebokitore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e4e7cc-a954-4c9c-baeb-b3b0a5198248/gevimesadugosoferepiwuku.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 5388 bytes
SHA-256: eabb3572d440371e7f35fd095aace022c465b4462e5c6094f1a6868fb68e15aa
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 10820 bytes
SHA-256: 618dbc144af0478c191067aa2d5d0de6e15ceaf2879ffb982286bdd8d85a1b6e
font_02_sfnt_off00011db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB0 16108 bytes
SHA-256: 97e80cc61ebbc6fe4ed03ffd5a5ae1d184ef07adb4204580ef84f3eb02720edc

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