Malicious PDF — malware analysis report

Static analysis result for SHA-256 82dc0ed01e55333a…

MALICIOUS

PDF

76.6 KB Created: 2021-02-18 11:12:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c7a6fea9ea2d2affd7f454e65a6c4bce SHA-1: 0c77db5fb66f658fe1c2ada3c2b05c04a917084d SHA-256: 82dc0ed01e55333a27d75ac1cce22467c6faa2cf454a44c01ad13cd2b50bcdb9
126 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. It contains numerous embedded URLs, with one specifically identified as a redirector to a malicious domain. The document body, though heavily obfuscated, appears to be a lure related to fitness, aiming to trick users into clicking the malicious link. No scripts were extracted, but the presence of multiple disposable hosting links and UTM parameters suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://druttle.ru/strik?utm_term=what+is+the+best+exercise+for+building+glutes PDF link annotation
    • https://putukaxuke.weebly.com/uploads/1/3/1/4/131437363/7149709.pdfIn PDF document text
    • https://jofudetazowus.weebly.com/uploads/1/3/1/6/131606688/xiximi-namuzopusa-mesusemase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370989/normal_5ff07156847b1.pdfIn PDF document text
    • https://cdn.sqhk.co/mewidexe/ciexeig/13812460719.pdfIn PDF document text
    • http://organicnu.info/tcl_roku_tv_50_inche7xij.pdfIn PDF document text
    • http://opsnatur.fun/tekugevinobuwofutefabav9an5.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/UGhaDBd/bingo_caller_pro_free_download.pdfIn PDF document text
    • https://lapedegino.weebly.com/uploads/1/3/4/6/134689006/6797409.pdfIn PDF document text
    • https://besukobar.weebly.com/uploads/1/3/1/0/131069863/sudowab.pdfIn PDF document text
    • http://sewowenokep.iblogger.org/38535637181.pdfIn PDF document text
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/1077340.pdfIn PDF document text
    • http://mubalupuzapo.22web.org/great_gatsby_menu_template_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nukixoxekixos.epizy.com/children_s_rhymes_video_songs.pdfIn PDF document text
    • http://folujas.epizy.com/69835525944.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 5388 bytes
SHA-256: 484a699ba78037e8a2438b3aa51d5a927f35c1d2c1928edf46dc849352ef1374
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 10388 bytes
SHA-256: 9940ecfb274b56a85a25b36cf9e07055acc24e7ccd436b98b7e5f1bbb98d4462
font_02_sfnt_off000116d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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