Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d75b1d68648a86…

MALICIOUS

PDF

67.2 KB Created: 2021-02-25 01:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e83777765aeb212563fe665a53f429b9 SHA-1: 160479d8b7ddbcb14d6e83f79a788eb0e9f08cda SHA-256: 43d75b1d68648a86917b53531e4adc8acf04e9eeb7c4bf75842b33232e61513c
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-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://leonvi.ru/strik?utm_term=kiss+the+rain+kalimba+tutorial PDF link annotation
    • http://rasudilikid.mywebcommunity.org/wexevim.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/1_metro_cuantos_centimetros_son.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/iehjrhk/95560471491.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451574/normal_6002d05e6760f.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/69946668248.pdfIn PDF document text
    • https://fazugiwe.weebly.com/uploads/1/3/4/0/134012697/kavon.pdfIn PDF document text
    • https://nuzuloluxeguvox.weebly.com/uploads/1/3/4/8/134874948/dowug.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/viwunol.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/djhhagj/2796765309.pdfIn PDF document text
    • https://malizopal.weebly.com/uploads/1/3/5/9/135962708/jisipanoguxif-ruxomu.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/film_review_essay_sample.pdfIn PDF document text
    • https://togijiwasifuva.weebly.com/uploads/1/3/1/3/131398416/betiraki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472773/normal_60287ae965768.pdfIn PDF document text
    • https://dasirexifavud.weebly.com/uploads/1/3/5/3/135320576/3135760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471723/normal_5fe9c97a3075f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sezewu/35665490921.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/75432166202.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/gavob.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4F 5100 bytes
SHA-256: 863ec5e2da156552940aa2bd1d9fdd487dc2b64489e684b92ce0257e47bb5da5
font_01_sfnt_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 9592 bytes
SHA-256: deafe6e33b5b5b402f111adb0a52ce2cb57369da6e4e65b33f784f955dffe983

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