Malicious PDF — malware analysis report

Static analysis result for SHA-256 49753d8e81081385…

MALICIOUS

PDF

74.4 KB Created: 2021-03-28 02:23:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3cf17240ffa29dc3697aea6ec278459b SHA-1: 3c1526cb7e1c009e8a1e148811b1c007dfb0b819 SHA-256: 49753d8e8108138550a2754cb8443ddba82784dde5bc12dae5e0dcc7bdefa501
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

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://nipisod.ru/award?keyword=assam+university+registration+form+pdf PDF link annotation
    • https://kuduxefu.weebly.com/uploads/1/3/2/6/132695679/e6865000.pdfIn PDF document text
    • http://natlab.ru/pigaxafg5b.pdfIn PDF document text
    • https://gosasomaf.weebly.com/uploads/1/3/4/3/134370397/beled.pdfIn PDF document text
    • http://cooldomen.space/nuzinefuromonisibumix5x5o.pdfIn PDF document text
    • http://autocredit.moscow/how_do_you_calculate_prevailing_wageey958.pdfIn PDF document text
    • http://alcozerox.com/what_elements_make_a_good_short_storyeukl9.pdfIn PDF document text
    • http://yachts-4-sale.com/643582318825xl4d.pdfIn PDF document text
    • http://smallita.space/lapogupupizevipufegeirnuv.pdfIn PDF document text
    • https://xuposebifaperep.weebly.com/uploads/1/3/4/6/134673232/derebis.pdfIn PDF document text
    • https://denutuzuno.weebly.com/uploads/1/3/4/7/134706868/betej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_99b4418f21d544b792556bf4159dbae7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/game_brother_in_arms_apk_obb.pdfIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_a76eff20a3884c7fa29d9efab5d673a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/verizon_fios_router_red_light_blinking.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/hypercholesterolemia_exercise_guidelines.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_244cc0e5fc0047639e37c263a64a8a81.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_1395f25956644d05a86006d34bc6a0f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/refrigerant_410a_safety_data_sheet.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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 5480 bytes
SHA-256: 630e5b0d022620d99b23c811b086dab970b4db267bded17d79f5c469ed1b11c8
font_01_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 11556 bytes
SHA-256: b01fa90fd49f60c3250c385d557893b0481862385398e470ef097251d255efbb

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