Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfffe0d61782dfb…

MALICIOUS

PDF

71.6 KB Created: 2021-03-21 09:17:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 033c28f8639cd0ae0c2c8f7e25fa72dc SHA-1: beb4c7f4807335978af0cc2aafc8ece998389e54 SHA-256: 5bfffe0d61782dfb758a387b20b87b79202b987f15b4bb9d4520fd19d906f4d9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The embedded URL `https://pelibifir.ru/award?keyword=regim+diabet+tip+2+pdf` suggests a phishing lure related to diabetes management. The PDF also functions as a link farm, directing users to numerous other PDF files hosted on various domains, indicating a potential distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/award?keyword=regim+diabet+tip+2+pdf PDF link annotation
    • https://cdn.sqhk.co/mavixuwaloz/iehejiD/94284400420.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/eSAigif/69494095150.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/lw6hcrk/72164757569.pdfIn PDF document text
    • http://kogikisarazomel.22web.org/17774400887.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/0cjc78l/led_control_box_app_control.pdfIn PDF document text
    • https://cdn.sqhk.co/gedugari/heie4CZ/final_fantasy_vii_remake_pc_steam.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/4b7ecf29-2e09-4158-b072-a9cd579d93a8/wedeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77cd34e5-e2de-4000-8c78-b0c1d4c4d62c/kuvumovijagozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ddc539e-f307-4b2d-afd3-e377649876d1/jatozuvuxowon.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/18966088563.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/254833538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1105fa10-c4f0-4e5e-88af-9c3f9e2e74fc/90985833671.pdfIn PDF document text
    • http://dirunexodov.rf.gd/67885238741.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/armored_core_for_answer_arena.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/69458289497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f2402d-a3bd-4f57-bbe9-5bfba026a623/98872549549.pdfIn PDF document text
    • http://bewojux.epizy.com/6593236405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c27de2e-a616-4dbb-8c1c-400f81b3daaf/tukizogaduromikupibokuxuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9704cb-a02c-4bb5-b952-b0e6f2b2fc1c/the_endless_summer_2_vhs.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/36770134714.pdfIn PDF document text
    • http://muvipifipu.rf.gd/56480446350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7e59d0-434c-4759-920f-915652f254e1/ancient_greece_gods_and_goddesses_names_and_powers.pdfIn PDF document text
    • http://sufazomewugexu.epizy.com/best_volume_booster_app_for_android_2017.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_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 5336 bytes
SHA-256: 946100f4b3f2ddf50a0faf5d84a9515f2697973370f971f151d9cd467a2950fc
font_01_sfnt_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 11104 bytes
SHA-256: ca12717371601c43c8d02fedb3fec41ed7ee7ba6566f6b93ba7ec81946452374

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