Malicious PDF — malware analysis report

Static analysis result for SHA-256 145d4ae5b22e8992…

MALICIOUS

PDF

75.5 KB Created: 2021-04-04 13:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: be50aea76908da5230305a31c2df54bc SHA-1: 5ac56a7f25c102600cda01f7d99749d0cfd05a3a SHA-256: 145d4ae5b22e8992059622a4e852ef8fee22c2e3c6dbc6cb44a537cc520a22a3
126 Risk Score

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 0.9997

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://jottigo.ru/strik?utm_term=how+easy+to+get+payday+loan+balance PDF link annotation
    • http://mudixefibewab.mywebcommunity.org/anlage_vm_vermoegen.pdfIn PDF document text
    • http://216tilford.com/86680370726a2omg.pdfIn PDF document text
    • http://remoliwagofaju.mywebcommunity.org/precalculus_with_limits_answers_chapter_5.pdfIn PDF document text
    • http://getallcreditscores.info/download_sahih_bukhari_arabicf1omi.pdfIn PDF document text
    • https://kotuposa.weebly.com/uploads/1/3/1/4/131406283/polarepofuko_pipoxokinegimo.pdfIn PDF document text
    • http://igbusinessabouthelp.com/learning_disability_health_action_plan_templatehhfmt.pdfIn PDF document text
    • http://qrastenmap.online/how_to_disassemble_a_pack_n_playtf4us.pdfIn PDF document text
    • https://bamukozigo.weebly.com/uploads/1/3/1/4/131406799/jibosiwibubete.pdfIn PDF document text
    • https://wiludexubusut.weebly.com/uploads/1/3/2/7/132740186/miwezezezatuniw_zilegivugut_vigifitovuzajoj.pdfIn PDF document text
    • http://fbdirect.site/xowiraxosufokakafetubepikwqxq5.pdfIn PDF document text
    • http://usacreditreport.info/how_to_start_a_senior_farewell_speechedw5s.pdfIn PDF document text
    • http://uscarins.info/lukagamoradidulor009ig.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/patebavi.pdfIn PDF document text
    • http://fastpysystem.online/how_to_reset_apple_tv_3rd_generation_remoteg02ii.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/bosch_500_series_dryer_manual.pdfIn PDF document text
    • http://1xbets-reg.site/object_oriented_programming_language_meaning_in_computer3plel.pdfIn PDF document text
    • http://allroadkamchatka.ru/suzuki_violin_school_volume_1acorm.pdfIn PDF document text
    • http://damvglaz2.xyz/honeywell_wifi_thermostat_rth6580wf_manual0ypcq.pdfIn PDF document text
    • http://kuboduzuke.mypressonline.com/tuwojef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/81258615721.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/kakawasogovadubiwowi.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_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 5440 bytes
SHA-256: e997804de9fba35e97cfa33c61c81d6ab2e9f47ef6d5a887ae0744829780f89e
font_01_sfnt_off0000fcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 10600 bytes
SHA-256: 686c719656dc4ae20331ed62f33c05db53620bada5c9c9879211b375f288eb7a

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