Malicious PDF — malware analysis report

Static analysis result for SHA-256 5182298ce5a8cc0a…

MALICIOUS

PDF

81.3 KB Created: 2021-02-19 19:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 859edbdbfdd72d9f32c9789238d3e8fd SHA-1: 7053c54cef27c09572efbde01c847dfbbfd9b483 SHA-256: 5182298ce5a8cc0a7b2d829fe4139245ce40ab579b571d42e672def05cd810c6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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/123?utm_term=how+to+train+up+a+child+in+a+christian+way PDF link annotation
    • https://cdn.sqhk.co/togodawexu/iakjhjd/bus_simulator_original_mod_apk_3._7.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/aIXia0n/8307841060.pdfIn PDF document text
    • http://kebilosudo.22web.org/98862638610.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/1597281.pdfIn PDF document text
    • http://disclosures.space/majosokotaxezeporalowowu5jfqg.pdfIn PDF document text
    • http://nuxutezupinel.22web.org/carotid_sinus_massage_how_to_perform.pdfIn PDF document text
    • http://yesnutural.space/wajogenokemulasufidgpznk.pdfIn PDF document text
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/3996517.pdfIn PDF document text
    • http://levelupguild.com/newsletter_templates_in_word_2016xpte1.pdfIn PDF document text
    • https://tamagokevalagir.weebly.com/uploads/1/3/0/7/130776783/rumume-vadawazaxi.pdfIn PDF document text
    • https://tigerabedudutid.weebly.com/uploads/1/3/5/3/135304069/2236152.pdfIn PDF document text
    • https://donedujawag.weebly.com/uploads/1/3/4/3/134315137/zokafudozidilu.pdfIn PDF document text
    • https://jipuziloki.weebly.com/uploads/1/3/2/6/132695969/804b5b87fe1.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/Qgc7d5s/free_read_along_books_for_first_graders.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/xananiwitajikupumi.pdfIn PDF document text
    • https://losebevaxefot.weebly.com/uploads/1/3/5/3/135347065/9285275.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/RiggeJV/tafimodogezipomulatewu.pdfIn PDF document text
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/volebumufagor.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
    • https://s3.amazonaws.com/fajonubinomeder/child_images_free.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/judot.pdfIn PDF document text
    • http://fafebexa.epizy.com/how_to_become_a_sports_nutrition_specialist.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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 5080 bytes
SHA-256: bdd860577c1f4425a5ba990f55f4efd22aa1fe44f74bb0a526a4de00327a44d6
font_01_sfnt_off00010572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10572 10568 bytes
SHA-256: 6e4580b60a8e9a91c5507c1267503e2bf692fef9370da252b325d6dcda916b35
font_02_sfnt_off00012971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12971 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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