Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df99608f14d0f8d…

MALICIOUS

PDF

85.8 KB Created: 2021-05-19 07:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5c5ab8cd1f139abb8df2ec0d8736573a SHA-1: 7a7ac5a88d6174628a6dd2baf956586e4883453d SHA-256: 1df99608f14d0f8d2ebc919d81e56e803e74c9abca18bfc73538bc6ae4254b8f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL `https://baarspo.ru/strik?utm_term=cartello+divieto+di+sosta+per+lavori+da+stampare+pdf` suggests a phishing or scam attempt, leveraging the document's apparent theme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the document as part of a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=cartello+divieto+di+sosta+per+lavori+da+stampare+pdf PDF link annotation
    • http://tofifevimal.22web.org/frontier_fios_router_installation.pdfIn PDF document text
    • http://xiguzot.22web.org/97493362298.pdfIn PDF document text
    • https://nateguwab.weebly.com/uploads/1/3/1/4/131453796/2414825.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423700/normal_5fc947d629fc3.pdfIn PDF document text
    • http://nisisigewu.iblogger.org/cantico_dei_cantici_testo_latino.pdfIn PDF document text
    • https://wetusaseri.weebly.com/uploads/1/3/5/2/135297966/wozumemetapadug.pdfIn PDF document text
    • https://sujepofuk.weebly.com/uploads/1/3/0/7/130775011/ruwazilosiw-bonamozuruxube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_60256ae1a01b2.pdfIn PDF document text
    • http://funomixukipiv.iblogger.org/bleacher_report_nfl_draft_round_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368951/normal_5fe4e385845fc.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/0a212d27-64c6-4833-9a27-eb42128d5937/pojililuvanepomana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ba7886-f315-4fac-bdcd-91a17cdd9c4d/ar-15_assembly_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd5c431-a767-4656-b764-bbfcd45bf266/33317206407.pdfIn PDF document text
    • http://mimajovomume.epizy.com/29589375877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16efa60f-a6f1-4b03-b424-a812fcb4ca57/vedasabagurorumoretod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6afdb6b-4a42-4ffc-b843-90478361bb98/tascam_portastudio_424_specs.pdfIn PDF document text
    • http://sijarobe.rf.gd/stardew_valley_bundle_guide_by_season.pdfIn PDF document text
    • http://sefogozi.epizy.com/ayatul_kursi_in_telugu_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7039139b-ad1f-4eaf-87b8-f16cadbfe62c/how_to_fix_brother_mfc-j220_ink_absorber_full.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 5152 bytes
SHA-256: 0134fad311b1a6b1efea12e7bd5a686e68283334f420373bcf607e6d79456356
font_02_sfnt_off00010d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D34 11200 bytes
SHA-256: 5b02ed077a5614bd5398ec2aa28f4a9350d4818f8a96c3bd189c300604e8c5a6
font_03_sfnt_off0001322c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322C 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d