Malicious PDF — malware analysis report

Static analysis result for SHA-256 332b25afba22b612…

MALICIOUS

PDF

80.7 KB Created: 2021-03-31 19:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a5192c1d1721ecf2261b381a0db915fd SHA-1: 1365a3405e3f469e2b9d4b2a5e67d1a1c39e65cd SHA-256: 332b25afba22b6121caa43f0848d88b533685e61cc4e447a257265fab6bfcb87
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. 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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://zajinet.ru/award?keyword=interest+rates+in+south+africa+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465907/normal_605f4a90a2b4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410214/normal_5fd25a6da06d5.pdfIn PDF document text
    • http://pigokakiw.iblogger.org/nozasikewuluxatod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_5fda7c0a1adf3.pdfIn PDF document text
    • http://setavifisotater.22web.org/genetic_engineering_and_biotechnology.pdfIn PDF document text
    • http://help-violation.com/common_english_irregular_verbs_listbua91.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/bqgcz6F/largest_aluminum_fire_ant_colony_cast.pdfIn PDF document text
    • http://wurijudopala.22web.org/fugumivetilukazogu.pdfIn PDF document text
    • https://cdn.sqhk.co/sifujubagis/fp03jfb/sukow.pdfIn PDF document text
    • http://fopijuzege.22web.org/93379445996.pdfIn PDF document text
    • http://manoligixave.66ghz.com/60715062686.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425227/normal_6003ce46b753b.pdfIn PDF document text
    • http://visemomasa.66ghz.com/geometry_inscribed_angles_and_arcs_worksheet.pdfIn PDF document text
    • http://contact-git.top/a_suitable_boy_review_imdbtntxd.pdfIn macro / runtime command snippet
    • http://7lessons.site/can_gluten_free_food_cause_diabetes46bi8.pdfIn PDF document text
    • https://cdn.sqhk.co/nojumuku/jaiieGY/delunijiledewosafowif.pdfIn PDF document text
    • http://igme.site/murder_hornet_sting_videogt1up.pdfIn PDF document text
    • http://visemomasa.66ghz.com/geometry_inscriIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vininotubosom.epizy.com/is_the_cherokee_national_forest_open.pdfIn PDF document text
    • http://widafasamuj.epizy.com/66325466418.pdfIn PDF document text
    • http://gidepajujida.rf.gd/harvard_university_acceptance_letter.pdfIn PDF document text
    • http://gevitejivojo.rf.gd/59939204901.pdfIn PDF document text
    • http://tuxugev.epizy.com/ejercicios_para_hernia_discal_cervical.pdfIn PDF document text
    • http://tisudaxutuz.epizy.com/what_page_did_lennie_kill_curleys_wife.pdfIn PDF document text
    • http://jeleruvimubag.rf.gd/77501886774.pdfIn macro / runtime command snippet
    • 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_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 5148 bytes
SHA-256: d437800802cb9739918633d5b2b5a48cd24a1dd13c3d89c682a4c1cf7f3915a7
font_01_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 11108 bytes
SHA-256: 8dd70ea4dc425f335397ee88099ac0e7ca489586f6d4360a0d9867474a4df42d