Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec46227021b0c1e4…

MALICIOUS

PDF

77.6 KB Created: 2021-03-31 00:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88538c108dfe4a5f811ab39578f7008c SHA-1: 3091fc7ba48b5d522cf7296f29c67984536daf7e SHA-256: ec46227021b0c1e4739cb57f930ff0231d50497fcb78880f2c1ef1d56af28901
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, suggesting a link farm or redirection to malicious sites, with one prominent URL being https://druttle.ru/award?keyword=mga+aspekto+ng+pandiwa+pdf. The document body, though partially corrupted, includes metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized PDFs that can serve as lures.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=mga+aspekto+ng+pandiwa+pdf
    • https://xuxewisi.weebly.com/uploads/1/3/4/2/134235501/kogulogu_xomidemawamal_lupovazofi_wipivujagugiri.pdf
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/1f37fe4dcfc0d8e.pdf
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/famupumaxiv.pdf
    • http://gosoxegekiri.mywebcommunity.org/dura_heat_dh2304s_23_800_btu_indoor_kerosene_heater.pdf
    • http://vujenixuwo.mypressonline.com/dunezinelu.pdf
    • http://lubevos.scienceontheweb.net/agriculture_in_ghana.pdf
    • http://fadewujetenuve.mywebcommunity.org/can_rahu_be_atmakaraka.pdf
    • https://jemewifawoboxe.weebly.com/uploads/1/3/4/8/134872293/vajemizupos-gazedar-bukuxomikezo.pdf
    • https://kipujoguburaza.weebly.com/uploads/1/3/4/3/134321983/7498322.pdf
    • http://nateribebomulaz.medianewsonline.com/electrician_hand_tools.pdf
    • https://jubojavinuduv.weebly.com/uploads/1/3/4/3/134316702/ba03dd5fba84.pdf
    • https://delumatoli.weebly.com/uploads/1/3/5/3/135392794/katibikedima.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4ebe1e6a-8a13-4145-b3c2-d2faed65f423.filesusr.com/ugd/a67e73_407870eef8234ef98e3e07f21685b5b3.pdf?index=true
    • https://s3.amazonaws.com/tezude/dutofaf.pdf
    • https://s3.amazonaws.com/nonabafat/neuroanatomy_made_ridiculously_simple_ebook.pdf
    • https://s3.amazonaws.com/daxemo/56084943487.pdf
    • http://dupepoge.onlinewebshop.net/rational_numbers_class_7_worksheet_with_answers.pdf
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_8dd67a853f3340cd8402c6feebca88b8.pdf?index=true
    • https://s3.amazonaws.com/lopadivupudexa/alphabet_formation_rhymes.pdf
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_0f79dfc09fd24fe8a018a06167defa10.pdf?index=true
    • https://s3.amazonaws.com/teximikamukubo/dorufosuvizoxekikado.pdf
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_121afa3089b646849b95f09a45e4c943.pdf?index=true
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_7cc49f028ab747f2ac5444116977d574.pdf?index=true
    • 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_off0000f18a.bin
1f496570c17b80a0339c3ef0d253fd4a1fef08b943e35dc508c201401f4a8145		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 5244 bytes
font_01_sfnt_off000103a2.bin
a010621df7550327ea5a4b631ab2b207f4a495d3c273dd9711e1b835998333ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 10508 bytes

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