Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d3fc22b69a65c7…

MALICIOUS

PDF

81.1 KB Created: 2021-06-01 12:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7cb2ee445a616b26cc7f372cf4b9ec71 SHA-1: 746a63d276016551be499364c6f13ee590c5c812 SHA-256: f5d3fc22b69a65c7cb9765aa9d143155a45e5ef8256a5e311b7d1def89902eb2
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary malicious URL identified is 'https://pixomot.ru/pbw?utm_term=actividades+para+ni%25C3%25B1os+de+segundo+grado+de+primaria+para+imprimir+gratis', which is likely part of a social engineering lure.

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://pixomot.ru/pbw?utm_term=actividades+para+ni%25C3%25B1os+de+segundo+grado+de+primaria+para+imprimir+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459055/normal_6039db0c6674c.pdfIn PDF document text
    • https://tagojakiwuki.weebly.com/uploads/1/3/4/4/134444274/6861031.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4421342/normal_60b1db41dadb4.pdfIn PDF document text
    • https://vogavova.weebly.com/uploads/1/3/1/6/131606390/zokotaxegaki.pdfIn PDF document text
    • https://beretukajawedu.weebly.com/uploads/1/3/4/7/134713042/vakopo.pdfIn PDF document text
    • https://wawedubogefolik.weebly.com/uploads/1/3/5/3/135391715/0c06c68c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488570/normal_602304d61cffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_60288e2ac6fe4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484994/normal_602e3caab9b6f.pdfIn PDF document text
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/5487278.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/aff0fbc8-f386-4a93-b6e1-b5ac642da59d/nebutotojuwoni.pdfIn PDF document text
    • http://siwuromo.pbworks.com/f/twilight_saga_part_3_full_movie_in_hindi_dubbed_download.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144434457/xoguvalenesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/139f8920-f077-4a9a-8fa5-e11b95879757/how_to_watch_the_ball_drop_on_roku.pdfIn PDF document text
    • http://bilabegape.pbworks.com/f/bcbs_of_michigan_prior_authorization_form.pdfIn PDF document text
    • http://gulisapil.pbworks.com/f/tekken_5_psp_romsmania_usa.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/f/rogasawij.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144444147/17853540076.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/how_to_pair_xfinity_remote_to_tv_no_setup_button.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 5624 bytes
SHA-256: 32d2a84c853922de34c737aec97d3c8674c864d9ff7996111113f74397ae88ff
font_02_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 2140 bytes
SHA-256: a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b
font_03_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 11348 bytes
SHA-256: ebe94ca4ee41e9fdea00c0611eafccd91f047a05c1afb6f4d5f56bada06f3821