Malicious PDF — malware analysis report

Static analysis result for SHA-256 2919c24fb6343a47…

MALICIOUS

PDF

76.3 KB Created: 2021-03-12 03:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d33ecc659887375e54a55aec0cc6a175 SHA-1: 2be6cab493d4aed658a9bb07afd0fafbd77ce24c SHA-256: 2919c24fb6343a4717de15259d9f325f3f3db1bd29f93b334ad0846b64f1a1e6
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://crophysi.ru/wix?keyword=chemical+formula+writing+worksheet+two+answer+key PDF link annotation
    • https://waxuxugiw.weebly.com/uploads/1/3/5/3/135312989/8660525.pdfIn PDF document text
    • http://cg-designer.xyz/ygdrasil_jorge_baradit_gratis5tri2.pdfIn PDF document text
    • https://wejitefokok.weebly.com/uploads/1/3/1/1/131164199/givibujeguti.pdfIn PDF document text
    • https://cdn.sqhk.co/nudabesawi/qnjfLgf/ego_sword_idle_sword_clicker_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/gbeEDsi/nokufu.pdfIn PDF document text
    • https://bexobejunoguwed.weebly.com/uploads/1/3/0/7/130775871/fawubuve.pdfIn PDF document text
    • http://getliterate.online/visual_basic_reference_manual9e7m0.pdfIn PDF document text
    • https://tonewebebajuja.weebly.com/uploads/1/3/5/3/135319275/rebiruvosener.pdfIn PDF document text
    • https://sigojexubaj.weebly.com/uploads/1/3/2/6/132682800/jelavor-kibowi-dezezol-zixepowe.pdfIn PDF document text
    • https://cdn.sqhk.co/kukusagufo/gjhdzVg/vakuwofot.pdfIn PDF document text
    • https://wanojotuza.weebly.com/uploads/1/3/5/3/135346096/1037034.pdfIn PDF document text
    • https://sujarusokebukok.weebly.com/uploads/1/3/1/4/131437349/5893190.pdfIn PDF document text
    • http://dsv-trening.ru/77179405284asc36.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/2igiegh/weed_factory_idle_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb38b30-1c4f-44fc-b913-0a3b98d1ae3e/80454703118.pdfIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_e49025a99de74a24941e522760bc1dad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92233af8-7658-4199-a45f-7c8929bbcad1/digno_eres_de_gloria_acordes.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_2e5f259eeff74ac385a8a86bf6d3e7c4.pdf?index=trueIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_e51c5f8003da4e8689a98560bd63e3eb.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_b11e6f7f59b34a67b97d28d5d1805f48.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_625f9f3054a046e49209e7143ee26d76.pdf?index=trueIn 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_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 5456 bytes
SHA-256: acb4effe98bcda2545cc7fcc6d58b62b357d3771606e2975214f2ea728cae21c
font_01_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 10500 bytes
SHA-256: c90aa9c8afba8d26590ac46e26f72c31c0b024ca2dacb78f8da976133eccea03