Malicious PDF — malware analysis report

Static analysis result for SHA-256 596f2cd72e2bd36a…

MALICIOUS

PDF

81.8 KB Created: 2021-05-08 11:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3f69784d9a89805254dd24e0e7fabd71 SHA-1: 7702037b0bd9b98fb4be7e56f9afc78aa6d03b0d SHA-256: 596f2cd72e2bd36a1f15a2c720ea25705ecd4e50e49949b7e6c509c374945dd6
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The presence of embedded URLs and the PDF structure itself are indicative of attempts to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=what+is+karr+security PDF link annotation
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/9886691.pdfIn PDF document text
    • https://lipuxavevafip.weebly.com/uploads/1/3/1/3/131398459/fesedotez.pdfIn PDF document text
    • https://gogalafubixuvu.weebly.com/uploads/1/3/4/6/134642314/kosabom-fexit-titamazogu.pdfIn PDF document text
    • https://dubiriji.weebly.com/uploads/1/3/1/4/131406762/poxoge_gogigapum_fugimefojefariz.pdfIn PDF document text
    • http://demumamudu.22web.org/51193138906.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/genetic_diversity_in_plants.pdfIn PDF document text
    • https://fapuwokezisojo.weebly.com/uploads/1/3/1/4/131453853/wirejex.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/tedemusunejaw.pdfIn PDF document text
    • https://voximarabot.weebly.com/uploads/1/3/1/3/131383255/9e229612ccd5.pdfIn PDF document text
    • http://koxenatez.22web.org/30506505115.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rufedum.rf.gd/lijazufigisulabilu.pdfIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_564a2dbcd14b45fbb9fd00988273956a.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_229ea52b1cb14afba2a9b0709c652655.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_e4c73e5353fb4c56ae6266e52ec8e698.pdf?index=trueIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_b0b82afec33242ec832b9a2e7076bb92.pdf?index=trueIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_a50c8938ce4b472f8cb2c4f61f5bc8b7.pdf?index=trueIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_2d7b14ad62164cccb200f0e7d0e6811e.pdf?index=trueIn PDF document text
    • http://taribizuka.epizy.com/grammar_for_ielts_writing.pdfIn PDF document text
    • http://beliraguw.onlinewebshop.net/bengali_english_dictionary_download.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_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 5032 bytes
SHA-256: f4a204cbcf10ce2396908efc2af69e89610b6cb0734c23d860ef6d0365b258d9
font_01_sfnt_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 11636 bytes
SHA-256: cc1cde3745bf55ed769c41cfc8666eb3fcb4b90bb5ee485a4dd7a0c838a64136

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