Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe499b2f49fddc2e…

MALICIOUS

PDF

67.7 KB Created: 2021-02-28 10:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 903bdb874baee005b9c632f49b0b4f72 SHA-1: a5ae73566dfdba7f0b5f6a55586707769e7284f3 SHA-256: fe499b2f49fddc2e479f5b3793acbd111c79be14879b4d0baed7a9cdc260c8b7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to 30 external PDFs. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the structure suggest an attempt to redirect users to potentially malicious sites, likely for phishing or further malware delivery.

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://baarspo.ru/award?keyword=gypsy+woman+aadhi+guitar+chords PDF link annotation
    • http://simopuvoramawu.mywebcommunity.org/user_story_acceptance_criteria_examples_given_when_then.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/eplQhet/neon_wallpaper_android_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/RicujbG/anz_mobile_digital_wallet.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/nghlpii/zanufasum.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/mojula.pdfIn PDF document text
    • https://cdn.sqhk.co/mifodirula/h7fidFj/insta_hash_tag_finder.pdfIn PDF document text
    • http://wigutanibip.iblogger.org/ximademazaw.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/chjjfxd/91465514696.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/buganabowumujef/58643320516.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/safaxetujukaku.pdfIn PDF document text
    • http://piwolimosopobu.myartsonline.com/46835149499.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/whirlpool_cabrio_agi_washer_manual.pdfIn PDF document text
    • http://fabodatutowew.epizy.com/66763691006.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/how_to_change_home_on_google_maps_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/xomikujira.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/gimokeke.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_off0000c5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F5 5680 bytes
SHA-256: 133a15e84bccef06c78005694bfcc2f7915d3960cf8435d8304a6d72d8c72653
font_01_sfnt_off0000d935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 11976 bytes
SHA-256: 60047a017787c64a7000c6d707aeb30885dd91c8a07bb75082dfd037139a7de5

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