Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62ecb0166fce9fa…

MALICIOUS

PDF

79.9 KB Created: 2021-04-01 11:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f9a4b71f2cf53d27d22670665716036d SHA-1: 77d633c8eebf29714db69399d93e097c296c3706 SHA-256: c62ecb0166fce9fafbbe522027127d7b44aa7964b63250addab029e66edd037a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to house cleaning, likely intended to trick users into visiting one of the embedded malicious links. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=how+do+i+clean+my+new+house+after+construction PDF link annotation
    • https://gerorajowivorem.weebly.com/uploads/1/3/4/6/134686153/zogifumom-fonigewoji-gugojoku.pdfIn PDF document text
    • http://instapresent.site/98285727772p2isr.pdfIn PDF document text
    • https://mojipidu.weebly.com/uploads/1/3/4/3/134391160/484d1073135f.pdfIn PDF document text
    • http://menformula.xyz/43913113101befg3.pdfIn PDF document text
    • https://nurosamemozixa.weebly.com/uploads/1/3/4/3/134375837/b46fdbc.pdfIn PDF document text
    • http://xomaweluk.22web.org/75655673850.pdfIn PDF document text
    • https://lidowape.weebly.com/uploads/1/3/4/4/134403474/1597009.pdfIn PDF document text
    • http://fudidudigas.iblogger.org/31787758832.pdfIn PDF document text
    • http://requiremcgood.com/8_mile_putlockerjrkvv.pdfIn PDF document text
    • http://douchehq.xyz/family_feud_questions_for_married_coupleswfvrh.pdfIn PDF document text
    • http://bofesota.66ghz.com/caesalpinia_pulcherrima.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/sirigagunupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mopasumugenivev.rf.gd/sugoxurigebisat.pdfIn PDF document text
    • http://nakepusejedub.epizy.com/57791922204.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/free_cv_templates_microsoft_word_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/python_flask_website_templates.pdfIn PDF document text
    • http://tofaveme.epizy.com/9506217143.pdfIn PDF document text
    • http://viruvivena.epizy.com/metap.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/calendario_laboral_madrid_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/18776337592.pdfIn PDF document text
    • http://robogotut.epizy.com/56605940881.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/sevokum.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_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 5416 bytes
SHA-256: c3cf1fcf9559009c0219c5eaddd7e2afc59357a2d50b3ac08c93bf2a3f5274c2
font_01_sfnt_off00010be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 11220 bytes
SHA-256: b9215d9ef1d57db84e48fddb548b45858d3d513481c29ba15d8a09ca181c12ab

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