Malicious PDF — malware analysis report

Static analysis result for SHA-256 064fbe5c90328001…

MALICIOUS

PDF

75.6 KB Created: 2021-03-21 21:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 85b3bcc5a54310d46f75c86002aa7dc2 SHA-1: c393cf0dc63a30057e8b041bab81f6d8d90eb0ac SHA-256: 064fbe5c90328001c35467230e0b7c7f38b123a914e892937230dbab9a650297
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 0.9992

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://leonvi.ru/strik?utm_term=an+introduction+to+language+fromkin+rodman+hyams+pdf PDF link annotation
    • https://cdn.sqhk.co/kuwusemob/CeW8Yie/rimidozilitimonofitiga.pdfIn PDF document text
    • https://tatedugede.weebly.com/uploads/1/3/4/3/134311852/nomominazojes-muzuku.pdfIn PDF document text
    • https://cdn.sqhk.co/bodevoposuji/gsAiggD/darakabowipar.pdfIn PDF document text
    • https://cdn.sqhk.co/tuturuno/gKjjghZ/jungle_marble_blast_2_pc_download.pdfIn PDF document text
    • https://difanewoxapazu.weebly.com/uploads/1/3/5/3/135321324/tomisedafagemubu.pdfIn PDF document text
    • https://rozogefeju.weebly.com/uploads/1/3/1/3/131398259/vujujabiparimon-rofikiluwugi-lexixulavubup-pogawimi.pdfIn PDF document text
    • https://rewegabelera.weebly.com/uploads/1/3/5/3/135390500/mifogivowuf-tikabuxatu-lujubew-wumiwibogig.pdfIn PDF document text
    • https://folutiniku.weebly.com/uploads/1/3/1/8/131871586/2bf22699.pdfIn PDF document text
    • https://birirewenojitu.weebly.com/uploads/1/3/0/8/130813362/8423e8.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/kijchgo/visolonos.pdfIn PDF document text
    • https://lekamenofujilap.weebly.com/uploads/1/3/4/6/134690267/pifitumilawadebo.pdfIn PDF document text
    • http://zixaxagewan.mypressonline.com/54064148476.pdfIn PDF document text
    • https://cdn.sqhk.co/kigakikijebo/ib4cHig/jiforakukinimo.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/4835020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_1c3d3acaf8de4bcf81d6960130a86a36.pdf?index=trueIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_150c5d32ece94cddac9ad5b810b3ae37.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_6768e77a20f045568be98e49a8d359d7.pdf?index=trueIn PDF document text
    • http://pevipitoz.atwebpages.com/weber_gas_grill_cooking_recipes.pdfIn PDF document text
    • https://a181bb3e-7445-4f1f-a1cf-b2fe66c13e92.filesusr.com/ugd/91ce54_96448b3128d849f596f5f940fef6d5a6.pdf?index=trueIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_4d17c3f7ba9d40f195d7fd20567141b5.pdf?index=trueIn PDF document text
    • http://fusozevukatamir.atwebpages.com/29472942407.pdfIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_60e2b6fd6758412691e703055b1a49dc.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_3baf5b5bb15d4275a964f853a2c0c80d.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_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 5724 bytes
SHA-256: e18cb62c8c2edd86b31d57f6ae2616076b04efc0816bf8bb49386496a2a9992a
font_01_sfnt_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 12392 bytes
SHA-256: 7be1482224a1854d55ea73c769669436816994850b56ed66ee7c659631067481