Malicious PDF — malware analysis report

Static analysis result for SHA-256 d383109a6d97c139…

MALICIOUS

PDF

78.0 KB Created: 2021-03-22 08:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27f3d78b5138ae9b160c9ab45ca36e7c SHA-1: d0cc986114575e283dbc7d2959def9ff2f1b4ca5 SHA-256: d383109a6d97c139eae70f188d716e478c4e6e8eddeb1d1364c2cc92aef2c917
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to improve search engine rankings for malicious content. One of the primary URLs, 'https://resalured.ru/strik?utm_term=digi+002+drivers+pro+tools+8', is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=digi+002+drivers+pro+tools+8
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/8365564.pdf
    • http://kozidozilujivox.getenjoyment.net/jizaw.pdf
    • https://cdn.sqhk.co/zavilisuga/yuij1gi/mutant_creatures_mod_1._12_2_minecraft.pdf
    • https://cdn.sqhk.co/pobijejok/iEwypu1/73778646090.pdf
    • https://pozimetotekiv.weebly.com/uploads/1/3/4/3/134339641/756ef.pdf
    • https://cdn.sqhk.co/bipokagiti/icoiggi/wuboxutezidunevux.pdf
    • https://cdn.sqhk.co/rikopekela/i6YeCuX/38646776582.pdf
    • https://libizegenumejav.weebly.com/uploads/1/3/0/7/130775388/lezoxezopuru-xaxisa-xezavekabeza-gikuperedefexeb.pdf
    • https://cdn.sqhk.co/foroboreb/fzxthj4/choppa_fortnite_trailer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_443e4af751914101bd71de79c33c1f18.pdf?index=true
    • https://uploads.strikinglycdn.com/files/277e7b20-571a-46d5-a5fb-db620c0447f4/dupes.pdf
    • http://gowepuxajotezo.onlinewebshop.net/tunapej.pdf
    • http://sufixis.myartsonline.com/visadigovefepovimuwo.pdf
    • https://uploads.strikinglycdn.com/files/b09d76b2-2153-4e35-96fb-4099ce0ffd2d/espaol_lecturas_tercer_grado_paco_el_chato.pdf
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_56434f28b83d459698a8c3826400194b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e0847b01-fbd2-4e3d-9197-56f9df4ea718/brother_mfc-7860dw_wireless_setup_mac.pdf
    • https://uploads.strikinglycdn.com/files/2cfe8bff-30ed-42b5-bab9-94561d8d1b6e/how_to_clean_mold_out_of_keurig_water_reservoir.pdf
    • http://kalasoziluxolim.myartsonline.com/wojanumenuwinapewiximujev.pdf
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_1003c4bd928e4edea46d5150fee6e369.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b486d86d-1e14-46cc-8bc0-9d95ed0b473d/56887345911.pdf
    • https://uploads.strikinglycdn.com/files/a46fbaa7-210d-4ef4-9a65-066daf392970/94430932350.pdf
    • https://uploads.strikinglycdn.com/files/fe0875b9-0b92-4cfa-9077-e8839c07a9e6/butamepunagulopox.pdf
    • https://uploads.strikinglycdn.com/files/39d97a00-6f3e-475d-ad48-bb0cd5e09422/31092757918.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f252.bin
4ee284cfa207abc59052aab1a7e786a71394b10bd9685ff99ac07cf53ce340b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 5444 bytes
font_01_sfnt_off000104fd.bin
d095fe9e5a70c1bd5b1dc7971ae0f9a71b66a40b06ca673fe345c5b0e33f6ab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 10980 bytes

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