Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1d4ae3112e64b1…

MALICIOUS

PDF

77.1 KB Created: 2021-03-22 09:33:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 54bddaee3b1292072f22eeb956dc88c5 SHA-1: e756f9d568f46d9fa445ea5ec320fe95120f3383 SHA-256: 7f1d4ae3112e64b1ec9f5c7554720127ac0f9336ec7ce7e0e55598568c63d0ab
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://golowaki.ru/wix?keyword=kwai+apk+old+version PDF link annotation
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/87037df0dd7d8.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/dih9jhe/jogemadinoxuvo.pdfIn PDF document text
    • https://nakaleraba.weebly.com/uploads/1/3/4/6/134606700/a71b5ce3507b9.pdfIn PDF document text
    • https://giwitororozesal.weebly.com/uploads/1/3/4/6/134652081/gopuw.pdfIn PDF document text
    • https://natutiwuv.weebly.com/uploads/1/3/6/0/136019317/lasive_kefopajolofom.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/affairscloud_june_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/bajafigotuvi/iqolNuj/waroja.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/jobukov.pdfIn PDF document text
    • http://newoxoxi.mywebcommunity.org/2021_release_dates_movies.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/6117981.pdfIn PDF document text
    • https://tibomomaludo.weebly.com/uploads/1/3/0/9/130969572/f8fb1788a1cb1.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/eZtNTOp/botipofefexegufubizesulo.pdfIn PDF document text
    • https://zenalebib.weebly.com/uploads/1/3/5/9/135966912/xamimuguniz-kilixa-mogiti.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/26447f5b-427a-400d-a18c-4bd5fbfd3522/86144463313.pdfIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_6620b65003e44baa9dfdb2b900675dac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb9afc7-647f-470b-a1ab-944daa2eb380/rumivozesanegezetoju.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_a9e14a2ce3c54c9d88061d0de6b07a41.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f29b138-9149-452b-8210-163745f4f6b1/interpreter_of_maladies_short_story_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7149d07-748e-46e8-8b9d-cd3197e34b06/integral_of_cos_x_sin_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9272b2b6-982a-4208-b4cd-31e75aaba521/15569348553.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_3d075122bc114241a29255060658af9a.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_1c74909d088749be8d7e076d34f1702a.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_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 5136 bytes
SHA-256: 8d693bb3f1673fd2a8b8ac417a1d6f510d35a1d877655b4a89537032a0de60ee
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 12588 bytes
SHA-256: ba5da7b7652b22e724ffb179b50cf20f2323310072cbacfc42be27f467c138cd