Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6fcd85a16c5a706…

MALICIOUS

PDF

76.7 KB Created: 2021-04-01 09:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8961a25a357283f9677a387c83681411 SHA-1: 1b88c7ad656ed28b7d0a6636e176a77b9f4c044b SHA-256: e6fcd85a16c5a706bd817a3c00057a64af12f5615eb72e508181868aa2001114
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URL 'https://resalured.ru/wix?keyword=13.2+electron+arrangement+in+atoms+answer+key' is likely the primary lure, disguised as an academic answer key to encourage clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wix?keyword=13.2+electron+arrangement+in+atoms+answer+key PDF link annotation
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/zumowojibizenakij.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/b4ec7b31.pdfIn PDF document text
    • http://tobalalupuvobiv.iblogger.org/bofenudo.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/zatasipezeg/microscope_parts_and_functions_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/kitchenaid_gas_range_model_kgst307.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/85033564080.pdfIn PDF document text
    • http://modezimuriji.rf.gd/lirotovowedewitisogufow.pdfIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_e88eb9815f6c4b9dba3a8f68a69cb423.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ninazarila/rireximakufipiluxofoged.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/couple_animated_pictures.pdfIn PDF document text
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_2fd610b064204dabb02dc338cc75c0e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4babfff-4082-4f62-a957-579cc64b2f53/diablo_3_season_22_builds_rhykker.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/defiant_180-degree_white_outdoor_led_motion_security_light.pdfIn PDF document text
    • http://segoxegigo.epizy.com/39522452753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e535f48e-e112-470f-9f85-b8ba6b9e8f1f/best_bread_machine_recipes_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/wepizogezazaza.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_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 5660 bytes
SHA-256: f77a83b3d724777f908345d19ab5fee278b48b9078b5454f36304873f803d9d6
font_01_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 10820 bytes
SHA-256: bc3914a64f3fb8dd44d206a38e7f261951102be861401d6df3f71bca809b9145

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