Malicious PDF — malware analysis report

Static analysis result for SHA-256 09926677fdd222f2…

MALICIOUS

PDF

103.6 KB Created: 2021-03-14 07:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fff22cab8570ad8d03c5ac344ef6dd2d SHA-1: 7a0ebe19aef9cad6fd9ab085f88ea0108d66c0f3 SHA-256: 09926677fdd222f294b0f14b851d419877634bc8b451b89d0631b78e79530a2c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://vilenefex.ru/123?utm_term=arjun+reddy+film+songs+ringtone PDF link annotation
    • https://pepakulal.weebly.com/uploads/1/3/4/8/134885681/4062653.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/nibxiFT/48163103270.pdfIn PDF document text
    • https://lafitezin.weebly.com/uploads/1/3/5/3/135323108/9442656.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/cCemrHw/free_android_app_maker_software_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jegetito/e8RgfpV/gain_followers_app_twitter.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/iifjcjg/summer_hair_colour_trends_2019.pdfIn PDF document text
    • https://tisitijalazog.weebly.com/uploads/1/3/6/0/136017937/segunig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_1b411effc1354133a5aa0920b0580ff5.pdf?index=trueIn PDF document text
    • http://sefibonep.rf.gd/ge_spectra_range_replacement_parts.pdfIn PDF document text
    • http://kazowaz.rf.gd/kroll_show_european_guide_to_america.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_b2da09b27b7644ffa2aee2d94159757d.pdf?index=trueIn PDF document text
    • http://jexoxitisujoj.rf.gd/24109220037.pdfIn PDF document text
    • http://nuworeri.epizy.com/jutolixumonuvigojibeboti.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_5acf7344951e4e6e84cac70a7daa9538.pdf?index=trueIn PDF document text
    • http://koferajovu.epizy.com/rudram_lyrics_in_english.pdfIn PDF document text
    • http://tefinavi.epizy.com/bio_data_template.pdfIn PDF document text
    • http://jiviwuruxaboku.epizy.com/sign_candidate_declaration_form.pdfIn PDF document text
    • http://lezebotetojezaz.epizy.com/2263805949.pdfIn PDF document text
    • http://zotoputoxo.rf.gd/pifojudamonutuzekufaxazat.pdfIn PDF document text
    • http://sivojosifa.epizy.com/difference_between_abridged_and_unabridged_annual_report.pdfIn PDF document text
    • http://kojusefum.rf.gd/bulutonosiw.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_c95e7fc0234a4cf481454b1cb34c259a.pdf?index=trueIn PDF document text
    • http://xobikiganerewen.rf.gd/233095670.pdfIn PDF document text
    • http://jekidosokun.epizy.com/bach_cello_suite_6_gavotte_sheet_music.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016d83.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16D83 20060 bytes
SHA-256: 8dc5ba6b27433f485526d7e0cd3174e6e60c7526baaa33332aa1cbc6eb3806d0
font_00_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 5184 bytes
SHA-256: 5f5c66c134fe4cbef127dde8e3c0dd73ef6cf37287317f0a38529c8a3c7e9c74
font_01_sfnt_off000133ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 3992 bytes
SHA-256: 644b088c9229a268304098549fff51be226debec92b11ed5c09269e908e17938
font_02_sfnt_off0001432a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432A 12920 bytes
SHA-256: cc62080e8f209ae535c3d5f3504c190f583309ad20b0ff2dfe787b4994b8fedd

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