Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffbd2c9b78679e8…

MALICIOUS

PDF

99.8 KB Created: 2021-06-04 21:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3937d68f843cec1a458af48a7d81768f SHA-1: de6daeb519326012ceac6b308392bf4ab5cef375 SHA-256: 7ffbd2c9b78679e826281bcf80cc7ce8e6fa8624668d7710980f0167dc49bfdf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://inwebjor.ru/pbw?utm_term=i-ready+quiz+answers+level+e+explain+relationships PDF link annotation
    • https://dojovirofolabi.weebly.com/uploads/1/3/1/0/131069789/7036311.pdfIn PDF document text
    • https://muxoramosuzuveg.weebly.com/uploads/1/3/4/2/134266249/zujipozasem_ralovaxajero_bipatoj_bewutupu.pdfIn PDF document text
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/vaxumomufubep-figititezefakin-gikefoxu-gidav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485718/normal_604d7117b2bc3.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/juzebujoxusanef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491450/normal_6002d2af20d35.pdfIn PDF document text
    • https://vawirinivilil.weebly.com/uploads/1/3/4/3/134353209/ae70dd51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446272/normal_60b89ce6c65b7.pdfIn PDF document text
    • https://purolakesis.weebly.com/uploads/1/3/4/5/134588460/fawot.pdfIn PDF document text
    • https://jitonugen.weebly.com/uploads/1/3/4/6/134617549/8d93a193515c6.pdfIn PDF document text
    • https://ninalekenapuboz.weebly.com/uploads/1/3/4/0/134017067/turababepulis.pdfIn PDF document text
    • https://sunapasodaveka.weebly.com/uploads/1/3/5/3/135330332/kifuwazira.pdfIn PDF document text
    • https://lufuzanexitib.weebly.com/uploads/1/3/4/8/134859686/185274.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xalomuzavege.pbworks.com/f/70676723102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b24a493-a786-46ae-b3e2-832ae6b960fa/pofiwatepetatirogaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e6ead7-afea-4120-a7f4-4a3c7d4f3743/68307062793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad4e6d19-1896-4546-a042-ababc10f060f/tohfa_tun_nikah_free_download.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144485346/17220870849.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144566808/nvidia_geforce_gt_220_windows_7_6.1_driver_download.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_off00013e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4A 5516 bytes
SHA-256: 4e1951d6c881d95e135665e9f56b67b247e514500d832c91265d63c6207e5cc7
font_01_sfnt_off0001512c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512C 14088 bytes
SHA-256: 301826f3c3a42b2eac252e249ee9760e238be1317fff5c3d06176be975f14341

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