Malicious PDF — malware analysis report

Static analysis result for SHA-256 163ec3585f9ebe79…

MALICIOUS

PDF

94.5 KB Created: 2021-03-05 11:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c6a9a24595480b4c227e0c9ecbacf379 SHA-1: cf0137e91c5ca57af2ff09517a9026f08a450b78 SHA-256: 163ec3585f9ebe79d620c4b5b1aa1c3dd6a420168774e9c009479db380b85606
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is a URL that redirects to a potentially malicious site, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=mtd+lawn+mower+parts+diagram In PDF document text
    • http://podarokinsta.online/bikumegapaxerin8flf0.pdfIn PDF document text
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/569cfee6a5afb9.pdfIn PDF document text
    • http://emirofficialzm.com/635981600728a3nw.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/2403700.pdfIn PDF document text
    • http://it50disconto.info/letter_of_recommendation_for_office_administratorirmbe.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/PhxTgjz/17868534539.pdfIn PDF document text
    • https://xulozajewe.weebly.com/uploads/1/3/1/3/131384688/3916e.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/hnh0lji/22373605525.pdfIn PDF document text
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/rotilisivo-vajidomeforas.pdfIn PDF document text
    • https://woraragupawajup.weebly.com/uploads/1/3/2/6/132681931/mejeg_punebaxigiv.pdfIn PDF document text
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/nopafela.pdfIn PDF document text
    • https://nepejudakolop.weebly.com/uploads/1/3/4/8/134876169/pusufobubidiz.pdfIn PDF document text
    • http://filajupixi.iblogger.org/40322931318.pdfIn PDF document text
    • http://winoraama.site/98969791504k7czm.pdfIn PDF document text
    • https://medimigo.weebly.com/uploads/1/3/4/8/134864966/gupasisapav.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/6gjwbjb/37208750567.pdfIn PDF document text
    • http://zoo-taxi.site/45532535871s3qyb.pdfIn PDF document text
    • https://cdn.sqhk.co/samigimas/hdha6hf/62600777095.pdfIn PDF document text
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/60a8cbcf6b2d253.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/gHhgggW/dr_driving_game_download_for_pc_windows_8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/021a5b45-1dbd-4708-b1b7-0f0940f860c8/sample_sermon_outline_format.pdfIn PDF document text
    • http://rowodebifofida.rf.gd/gadejixasezawafofegifade.pdfIn PDF document text
    • http://kisezemewarajox.rf.gd/how_to_eat_2000_calories_a_day_vegetarian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a81c94-318b-4f02-8157-2afc5f1f67d6/en_el_principio_el_espiritu_de_dios_acordes_para_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/112d8c31-8223-49e0-8db1-a55f84365862/ladipavexipaxikebox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/538e19dc-74aa-444c-ae78-a5128d7ffd57/learning_python_oreilly_amazon.pdfIn PDF document text
    • http://xewewiwuxadul.rf.gd/fexewumukel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2851c7d4-3564-423f-a39d-f1dddb039803/vewob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 5164 bytes
SHA-256: 3b6806fab43c38b1d1591d2603864e33088ef85bdb1b4c1ea248deb17bfd6a2d
font_01_sfnt_off0001386b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386B 11052 bytes
SHA-256: 19ed590e72843e2e5b61a73c6c662fb078ce1bb0ed18f076b7d56282f51747d0
font_02_sfnt_off00015def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34