Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d70b19eb8827c1d…

MALICIOUS

PDF

58.0 KB Created: 2020-10-11 05:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bd24f442918a8d0226d33a39261890e8 SHA-1: aa06d8f67b1f69f159d6211331b7492c8bd8b3d7 SHA-256: 5d70b19eb8827c1da34f5f0cc507d1745e0849af455904d1f3a95cac794389a3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable domains and a known malicious redirector. This indicates the document is designed to lure users to malicious sites, likely for SEO poisoning or to serve further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?keyword=strategic+management+of+technologica In PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/birulerugaked.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/tibipemeketuxidanelos.pdfIn PDF document text
    • https://site-1038762.mozfiles.com/files/1038762/xafosetujibone.pdfIn PDF document text
    • https://site-1038759.mozfiles.com/files/1038759/97432271960.pdfIn PDF document text
    • http://files.openingnightcostumes.com/uploads/1/3/1/6/131637218/5859254.pdfIn PDF document text
    • http://files.chrispgleason.com/uploads/1/3/0/9/130969562/xavoju.pdfIn PDF document text
    • http://jitujaxo.jessicagarrigan.com/uploads/1/3/1/1/131164021/gigezifezada.pdfIn PDF document text
    • http://files.fairyboatscrubbers.com/uploads/1/3/0/7/130738835/90111a23.pdfIn PDF document text
    • http://zumawa.dorangoats.com/uploads/1/3/1/3/131383893/7193020.pdfIn PDF document text
    • http://vuzoreku.flemingbaird.org/uploads/1/3/1/8/131859261/leres.pdfIn PDF document text
    • http://files.kanadanzey.com/uploads/1/3/2/7/132710603/fukuzugirufup-koginif-fidojarujofom-mevusono.pdfIn PDF document text
    • http://files.yourfic.com/uploads/1/3/1/4/131437307/4971770.pdfIn PDF document text
    • http://mebotoras.mywisdomboard.com/uploads/1/3/0/7/130739723/wijevazaj_fekajusopovukof_xesupunovujuk_rerufawidisulo.pdfIn PDF document text
    • http://files.madmanadvertising.com/uploads/1/3/1/4/131453645/vexidiribipelejuk.pdfIn PDF document text
    • http://files.bossmomlife.club/uploads/1/3/1/4/131437254/95f11df.pdfIn PDF document text
    • http://dojafe.dermamedic.net/uploads/1/3/2/8/132814241/216e8be569.pdfIn PDF document text
    • http://files.alyssarcieri.com/uploads/1/3/1/8/131871518/suvize_muvugegowatud.pdfIn PDF document text
    • http://files.coupevillelions.org/uploads/1/3/1/3/131382274/kogejemiven.pdfIn PDF document text
    • http://files.wvrra.org/uploads/1/3/1/1/131164358/1959921.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000a5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D3 5220 bytes
SHA-256: 69aafbe1ed0b5ea01fabb083fd822f8a3e330b6a4a6939ea70a753c7c3eea36c
font_01_sfnt_off0000b762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB762 10220 bytes
SHA-256: cace225167b1efbca0f74a352e98a130981ce07b72f7735a4d273d9d90dda1a9

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