Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d3521d49c91883…

MALICIOUS

PDF

94.7 KB Created: 2021-02-23 04:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b35872c265115a93c69dad4a70cc689a SHA-1: 5a5c13f50f8913f11fb871599048f7fbdad6a349 SHA-256: 39d3521d49c91883c009304cdb89dab14ddcac18abe154bada2593991c4895f8
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm and a high ML score. It contains numerous external links, many pointing to disposable hosting services, suggesting a phishing or SEO scam. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/aws?utm_term=common+trigonometric+integrals PDF link annotation
    • https://kaxebovirufuj.weebly.com/uploads/1/3/4/3/134399635/9529509.pdfIn PDF document text
    • https://cdn.sqhk.co/ratobomebal/fgejhge/zavopudinakadenefivitu.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/welimaxonib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368242/normal_5ff310ed24856.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475564/normal_5fefd0e0c992f.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/2hjgieR/buwasi.pdfIn PDF document text
    • https://sevujixosatanin.weebly.com/uploads/1/3/5/3/135316334/wuruvesawoj_podasow_zibuxanufavudop_powab.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/hnjjijh/jivaravudutunoge.pdfIn PDF document text
    • https://cdn.sqhk.co/takepoladev/zjbHjdA/metropolitan_theaters_goleta.pdfIn PDF document text
    • http://freds.space/wutupuxemetagowkmspb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_6023d182afa77.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/ijgjaje/zixanab.pdfIn PDF document text
    • http://mignonette.space/74445636294oa9ua.pdfIn PDF document text
    • http://reliables.ru/timed_addition_worksheets_1st_grade6k409.pdfIn PDF document text
    • https://jawuwokobot.weebly.com/uploads/1/3/1/3/131381435/doxutit.pdfIn PDF document text
    • http://limons.space/unexpected_eof_golang_templatea685c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466661/normal_5fcf67953e2ac.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/piwanisaj/worksheet_on_homographs_and_homophones.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/xoxovabewagob.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/61319148704.pdfIn PDF document text
    • http://pifutujotot.epizy.com/active_admin_actions_form.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 5024 bytes
SHA-256: 4940a2421c47f72a4f6fdbe160c0a5aff85bf5f8092ce0e90a8be8286adb3783
font_01_sfnt_off00013060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13060 11184 bytes
SHA-256: 8473a1d4b62a4175afee504521334237df6c1acebb2b1b78658dec270bf9bfc2
font_02_sfnt_off00015704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15704 16316 bytes
SHA-256: 725f727af13161eabc6bb542d293ed23289e925bd05a4239f551ba52ba3b5493