Malicious PDF — malware analysis report

Static analysis result for SHA-256 882d9947ae81a0e2…

MALICIOUS

PDF

77.7 KB Created: 2021-05-30 20:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d0cf0670f74cbf8c8cff437b251910ef SHA-1: ea018be3f0c2243a5d13d7344bbb01ce6305513c SHA-256: 882d9947ae81a0e27aa8f12c22b1346b4959b4f924f9ee5efa4ecb0c6dc15a1f
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://jacksth.ru/123?utm_term=html5+css3+cheat+sheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387939/normal_6009858ca1ada.pdfIn PDF document text
    • https://xalakadumikimam.weebly.com/uploads/1/3/1/4/131437423/sirove.pdfIn PDF document text
    • https://nitipitu.weebly.com/uploads/1/3/0/7/130775162/fenodewokowakov.pdfIn PDF document text
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/7429956.pdfIn PDF document text
    • https://tekejixebosij.weebly.com/uploads/1/3/1/4/131452745/0a59b59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_5fed7da934641.pdfIn PDF document text
    • https://wugivata.weebly.com/uploads/1/3/4/8/134872137/bf5086a43603.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/557839123b5167.pdfIn PDF document text
    • https://mafinejolid.weebly.com/uploads/1/3/2/6/132683008/nubekodolada.pdfIn PDF document text
    • https://mekixumurolulem.weebly.com/uploads/1/3/4/5/134598648/3000672bbf27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486566/normal_60546f03505fb.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/5551b6d1-a511-4f3c-aef3-14516dbb7481/niremisaweravapanas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecabe45f-284e-42d8-866c-51cef6acd2ca/linux_system_programming_jobs_in_pune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd838ae-cdce-4447-b18f-469dff7a90c1/sample_research_proposal_english_literature_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b88009-ef2f-45d8-b74e-a58610b23dc4/86663373800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30851a56-c8c5-419d-bed2-c31ebbfeab5a/tetikolapajolewasab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580ffb4c-fc6c-4467-9dd2-e7d8cf463bfe/nuxufokebuforirosuseka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d72aa83-f1c3-417e-ac89-03570771c9e1/new_sales_simplified_chapter_4_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de61aba-83e1-41b0-bcc8-6d7722174ede/the_me_i_want_to_be_kindle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c94099-d3c8-49a3-b628-ef0948186724/jazipogumubexepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d5e4ff-1197-4451-95f6-f326dda76631/84436702570.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_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 5192 bytes
SHA-256: d9f150657a8204291eb0cd631845689d479b5c363b446010af18ddf7aa70d5e0
font_01_sfnt_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 10656 bytes
SHA-256: beb84224e6e8200edd07f86ada3d5a09e92a4d3b60972986c7e652b3e1e7808a