Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e67bdfc0b188d9…

MALICIOUS

PDF

74.6 KB Created: 2020-12-29 14:19:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b1f7c3e94e16e334a3fe26cd1a62ba06 SHA-1: ecddd3a5da9a8d5304818b3e55549e2d4032ee10 SHA-256: e8e67bdfc0b188d9b55913bcbd0d7f7d60bd121dc1dac8ee0208297cb1729ba8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as 'Pdf.Phishing.Trojan'. The embedded URL points to a suspicious domain, likely used to host malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/strik?utm_term=hot+rod+garage+episode+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455178/normal_5fd6460a28d17.pdfIn PDF document text
    • https://cdn.sqhk.co/gerukoso/dBZQwie/5942291759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_5f950d2a634df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_5f909e571844a.pdfIn PDF document text
    • https://kavuxidawikux.weebly.com/uploads/1/3/4/0/134000359/rididumulepev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386830/normal_5fddae25df58d.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/zuxadol/12888914451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddee2b04-6c65-4c55-a391-cab750633833/mapitiduw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cd547e5-ec06-4b42-af58-d49dd15a0861/56041592978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b3ce36-2c4e-4daf-b948-fcf2a8820b21/fojinud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb80e9c-eb84-489c-b7a6-4013f62ade52/66606184296.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/97353129943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3aa68ce-62d8-4d65-8fd7-67106ae36da3/connective_tissue_worksheet_answers.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_off0000e50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 5108 bytes
SHA-256: 6bcdfea5c861d16c10ad02ceb5d3d61acd8d1b525fa4b8e43c0680a3c3363db3
font_01_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 11684 bytes
SHA-256: d77da73486348f6347927b970ac752cd7698d9f49c3079b463102101b6a6e424

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