Malicious PDF — malware analysis report

Static analysis result for SHA-256 910677b1e0c179eb…

MALICIOUS

PDF

73.8 KB Created: 2021-03-25 08:00:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: dc2da48a499e556e54e46aca309b5cf3 SHA-1: 202dede7dec2b71f060cff3a73591ea6fadbfe7c SHA-256: 910677b1e0c179ebbfacfdd05a56c0761a486461e882fa4538fade0521fa6431
126 Risk Score

Malware Insights

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

This PDF document was flagged by an ML classifier as malicious. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the primary URLs extracted is https://jottigo.ru/strik?utm_term=what+oil+to+use+for+honda+generator, which is likely used to redirect users to further malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://jottigo.ru/strik?utm_term=what+oil+to+use+for+honda+generator PDF link annotation
    • http://bitejodimoni.iblogger.org/46300346364.pdfIn PDF document text
    • https://govabegos.weebly.com/uploads/1/3/4/0/134018252/gelana-wiligekugov-mudodere-wifalun.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/e10e4d763e9.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/ijjtIhg/indications_for_cesarean_section_guidelines.pdfIn PDF document text
    • https://wibipujesotut.weebly.com/uploads/1/3/1/3/131398272/8179d356d474.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/86adfe8f.pdfIn PDF document text
    • https://lukobojamema.weebly.com/uploads/1/3/4/3/134317851/c02cc3.pdfIn PDF document text
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/8479435.pdfIn PDF document text
    • https://rosolivemimej.weebly.com/uploads/1/3/1/3/131382018/suzepipujegil.pdfIn PDF document text
    • https://cdn.sqhk.co/jogujufuza/HjagfFX/11670987185.pdfIn PDF document text
    • https://vetedikagumon.weebly.com/uploads/1/3/1/4/131453784/8582525.pdfIn PDF document text
    • http://davizaxokekibe.iblogger.org/egyptian_gnostics.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdfIn PDF document text
    • https://tegomufowake.weebly.com/uploads/1/3/5/9/135958876/xuxetusogozug-pojox.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/fejififimaketo/bocio_nodular_difuso.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/fidelity_beneficiary_designation_form_ira.pdfIn PDF document text
    • http://wewejozajukenat.rf.gd/68420298332.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/resor.pdfIn PDF document text
    • http://zakefozufasedi.epizy.com/19466717838.pdfIn PDF document text
    • http://tinejamuwaki.epizy.com/genadomegudi.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_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 5184 bytes
SHA-256: 1b70cbbd459fe79f3f4ff875bf4c432c26b742e939f8c3d476f3c4c033231993
font_01_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 10636 bytes
SHA-256: cd2a72a22dc86a27deca0cb094d90ec54bdd9fc173271d85e5231b36e9f315e7

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