Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fc86c0cedd1cf1…

MALICIOUS

PDF

85.6 KB Created: 2021-05-10 05:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ae3e367a5742c6e33ffd237b24dd7f0e SHA-1: 5c78cebe369f37aeff3e726d4c1000b2e4c7aac8 SHA-256: 10fc86c0cedd1cf11814c8f55a3b87dd20a8925b1012bb38692bc16c74385dcc
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the sample for containing a link farm on disposable hosting, further supporting the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/strik?utm_term=what+planets+are.visible+tonight PDF link annotation
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/3b286146c3.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/renalazowazam.pdfIn PDF document text
    • http://gratoramaa.space/how_to_use_jbuds_air_true_wireless_earbudssp3os.pdfIn PDF document text
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/jigomak.pdfIn PDF document text
    • http://videohost.space/adobe_acrobat_apk_mod627jm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493221/normal_5fdc1210eeb5a.pdfIn PDF document text
    • http://skidki-day.site/57528141151pf76g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479460/normal_5ff44a805c008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_60693c561b9b4.pdfIn PDF document text
    • http://mx50off.pro/35568148057urxv6.pdfIn PDF document text
    • http://shtancircul.site/99323121655ykwoe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477637/normal_5fe4360ad1c31.pdfIn PDF document text
    • https://pixerogamaba.weebly.com/uploads/1/3/1/8/131871590/4174589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427499/normal_6039d2ad5f450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498392/normal_6025bd11e299b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416654/normal_603ab354c9eb3.pdfIn PDF document text
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/nujozokafadudo-dupokezuge-tanoj-lubuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496374/normal_60068934af477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5ff968e171f0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bagitokukuwulo.epizy.com/advanced_financial_risk_management.pdfIn PDF document text
    • http://jazosorolanik.rf.gd/24868115881.pdfIn PDF document text
    • http://nabesazuxipuf.epizy.com/53482873057.pdfIn PDF document text
    • http://fituguguras.rf.gd/the_boundary_element_methods_in_engineering_banerjee.pdfIn PDF document text
    • http://zezinoretebeper.rf.gd/libro_thermomix_bebe_alimentacion_saludable.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_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 5328 bytes
SHA-256: 714f1070ea27409684d95b3593dcd4533ffc934fb18645bbea7665a5c1000c81
font_01_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 11824 bytes
SHA-256: b1d3a035339df3e5fb728e27fd19387568eca5a21516ee1a1635a8ce40bcd31a

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