Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b78041fcb08a7d…

MALICIOUS

PDF

111.0 KB Created: 2021-03-30 09:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6c0fbd1270457cf944875dcdf4d37213 SHA-1: c48461db5cf540c870b932b2bb7f466a9c4b7984 SHA-256: f9b78041fcb08a7d10610bec78df0a3ba8cc5e38c558c9148de3e02c4e060116
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/wix?keyword=dimensional+analysis+worksheet+with+answers+pdf PDF link annotation
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/gejemivovot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407724/normal_600f1e7a7a11e.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/a1df32f8217190.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/advanced_cost_and_management_accounting_notes.pdfIn PDF document text
    • http://tixshopclub.space/supplement_facts_template_illustratorczqlo.pdfIn PDF document text
    • https://zedowami.weebly.com/uploads/1/3/1/6/131637063/9553090.pdfIn PDF document text
    • https://rekopazexejur.weebly.com/uploads/1/3/4/6/134602417/76c71ed1e5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426416/normal_601105c7e4cf3.pdfIn PDF document text
    • http://goodsun.space/dizojawenadukidizodamazd1pn3.pdfIn PDF document text
    • http://baby-slings.ru/how_to_sign_into_ubee_routeryvvbo.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/rogavupi.pdfIn PDF document text
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/59d4534babb0fa.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/09b4f99ad360bc.pdfIn PDF document text
    • https://zujavezamuni.weebly.com/uploads/1/3/0/9/130969293/ab393b9.pdfIn PDF document text
    • http://thailandlove.site/girls_frontline_pco4cwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/numomopinovir.pdfIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_8d37be9db5cd4bccbe55b3af9d73d2ef.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_62f31ff313ea44c687961865921f09ba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000169a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A2 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off0001739c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1739C 5540 bytes
SHA-256: 2999a3457f1c388c17d64079d73a517196f58e885407665a32260641b0a6f01e
font_02_sfnt_off0001865d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1865D 11528 bytes
SHA-256: a4cb5703257deccac2a54e61f69c581996c97422e79e62a824e3060dfcb6ba68

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