Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28826c64ae1389b…

MALICIOUS

PDF

82.8 KB Created: 2021-05-20 11:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 67a9c19bb427060fa4af4ef4465211b5 SHA-1: 9112ad2b59a28b5986f1bda73d6c142809236e26 SHA-256: e28826c64ae1389bbf11fb644507d6d67c58b9ada799735dbd5a77ce8de85b85
156 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 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=ballasting+and+deballasting+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475382/normal_60226dbf58ae2.pdfIn PDF document text
    • https://niliwavinifof.weebly.com/uploads/1/3/4/6/134687551/2f5938baee7e.pdfIn PDF document text
    • https://jogosoti.weebly.com/uploads/1/3/1/4/131453036/pipezozabanujim_midepamotaxo.pdfIn PDF document text
    • https://navemozozaju.weebly.com/uploads/1/3/1/1/131164567/bibevujukepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5fd624ec5402a.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/464aee45-6ae9-478e-9d28-aff6de93c681/air_force_academy_female_percentage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6695c3d6-f426-41a9-b580-80e068191f49/jewizewozipo.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/lemow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/619a731b-d487-438c-9116-fcf7d3972e2c/lonivisimenutaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d38f13c-b559-436e-90b9-d5bba02304cd/jefusevularezudufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/437e3e4e-e278-47e5-b469-cdb33591ffe2/kujebogoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22c7579f-addb-444e-b7a5-27adff705b5e/ledikovufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f6584b3-60fa-42e9-9a51-be60d693dbf9/sosatigavulekot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81c70a3-0a56-4124-b944-194c69c22c1c/xiwudenusepodimuguwaxeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7bb61b-d93f-41ee-a62d-b28778d091f4/clover_mini_iron_ii_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab4e35d-f793-4cf3-99d7-9e0a1e1d164d/zerigiz.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/aircraft_weight_balance_form.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_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 5304 bytes
SHA-256: c7cefa1e4f9fa4c2738342ec430824e4f315c17638975b12e58acf7cf3e675a0
font_01_sfnt_off000118c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C2 11020 bytes
SHA-256: 5ed22334bee96d76fd245d778a9bc24531ebb263b95b053f93c52af5d925471c

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