Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b2216591c9e2b2…

MALICIOUS

PDF

73.2 KB Created: 2021-04-20 10:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1f9a33330a5a2d992303b2dcf6b65336 SHA-1: 25887f058537bac66f51c6de7fb80631d42fb80f SHA-256: b7b2216591c9e2b231600dd78a7562f6747bbbcfcb825fba9a298eb7b9df68c1
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a suspicious domain 'midufefew.ru' that is likely used for phishing or malware distribution. The 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection strongly indicate malicious intent. The presence of urgency language further supports a phishing pretext, aiming to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://midufefew.ru/strik?utm_term=throne+of+glass+paperback+set PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494166/normal_5fc9e24f68c57.pdfIn PDF document text
    • https://fojumotapikapig.weebly.com/uploads/1/3/4/3/134372119/630eb7f5a5.pdfIn PDF document text
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/jujajaka_losijirapow_renewinab_xoravelob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420014/normal_606551ea10835.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476954/normal_5fc89900cc6cc.pdfIn PDF document text
    • http://cybety.xyz/red_ball_garage_nycvhjci.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497110/normal_606936f95c36d.pdfIn PDF document text
    • https://ronifevux.weebly.com/uploads/1/3/4/7/134737402/regibuzunowiv.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/siwawu.pdfIn PDF document text
    • http://5coupons.info/rainsoft_water_softener_parts_diagramdpvrr.pdfIn PDF document text
    • https://menuzuxa.weebly.com/uploads/1/3/1/0/131070619/3a506247e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/3342394475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d8f80a-cacc-43a1-93d2-5f16f5e81e6c/ruravibifefigawugifo.pdfIn PDF document text
    • http://xulivef.rf.gd/95262908236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f087f2-2f94-42df-84ad-aaebcb83de71/what_is_the_meaning_of_color_constancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0069cc80-3f11-4e78-95ef-c7f6dafa89ef/votipemozupogakokug.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/ludapibekemiro.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/arabic_english_calendar_converter_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0d5667-41ce-43fb-a18c-db4940733fc8/how_to_turn_on_hampton_bay_fan_without_remote.pdfIn PDF document text
    • http://rexoxejaj.rf.gd/adverse_drug_reaction_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81526abb-b451-493b-9673-3dc6cf4b641d/can_i_play_my_record_player_through_my_tv.pdfIn PDF document text
    • http://mevidow.epizy.com/94373279628.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_off0000e007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 5428 bytes
SHA-256: ed55b0988d5e747bf41d43c46f746b45663f0bedca1c01694c4fd6ab1caa8f2e
font_01_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 10996 bytes
SHA-256: c53f33017b4bba1cc86e4a6e0920af7485fbcffd082560ac28f1743f43f0738d

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