Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2e3df0a5da7ff3…

MALICIOUS

PDF

82.4 KB Created: 2021-03-20 18:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2ac83729b7d464c38ebfd58d3b8b1304 SHA-1: 18aa65d83a97d7689c821b97abea854f1cf7ab49 SHA-256: 7f2e3df0a5da7ff319e65c30eaadbc6912287389d5230acc4c8545f6ee0d1a1f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=the+house+of+spirits+movie+download PDF link annotation
    • https://xetasigebe.weebly.com/uploads/1/3/4/4/134443645/gadawisusefawetibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_6012c112177c7.pdfIn PDF document text
    • https://bulipegorevuju.weebly.com/uploads/1/3/4/7/134700868/3f16ad.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/a8VbmYK/flight_simulator_2018_flywings_free_download_pc.pdfIn PDF document text
    • https://vemesefopega.weebly.com/uploads/1/3/4/6/134684253/3360818.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/fgeeeSI/my_singing_monsters_wiki_breeding.pdfIn PDF document text
    • https://lepabamun.weebly.com/uploads/1/3/1/6/131636917/fepere.pdfIn PDF document text
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/rifibiv-gepuxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463791/normal_6002b72ed3f45.pdfIn PDF document text
    • https://gotagifegu.weebly.com/uploads/1/3/1/6/131607164/xepuzaleve.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/efAJjhH/konami_otp_token_world_worldwide.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/gjd5bhc/tabletop_prelit_christmas_tree.pdfIn PDF document text
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/5224635.pdfIn PDF document text
    • https://tenomexob.weebly.com/uploads/1/3/1/1/131163969/6549130.pdfIn PDF document text
    • https://cdn.sqhk.co/jumivosokigo/Bihihhw/thoracic_outlet_syndrome_symptoms_headache.pdfIn PDF document text
    • https://jelakuge.weebly.com/uploads/1/3/1/8/131856802/zitovosefojukuvaxo.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/3f0a200a-be57-4626-89d1-6688550a1cea/how_to_hook_up_a_badland_winch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2dfbfdf-4ff9-4220-8a3e-1de8ae111214/guzasibedamopevegiganused.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbdf0a17-5a83-40f1-9f9e-e4c5cc28f7f2/value_of_1959_nancy_drew_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82456962-4b6f-4537-8dbe-d88a88efd3b4/qcy_qy7_bluetooth_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f51c4e-4943-4e95-bca5-2a1bc0c32757/how_tall_was_hae_min_lee.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_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 5380 bytes
SHA-256: fba8daed087b59c6aa937bda44348b8a91f4417868755dd3860d0494c9ab5da0
font_01_sfnt_off00011765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11765 10996 bytes
SHA-256: 7adb98a99450da063893887d656e648d9d6c161a5449c3219145bc88143f6194