Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda734aac5909c18…

MALICIOUS

PDF

64.9 KB Created: 2020-12-11 20:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8ef8fc5021cc898aadc10f7fd66796e9 SHA-1: e568da097c1644eddd00edd054a273ce3d92655c SHA-256: cda734aac5909c18385a571177c615ffe95053e99bebae0ab31567c00926dc92
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm designed to drive traffic to external websites, with one URL specifically mentioning a game patch. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/wb?keyword=battlefront%202%201.%203%20patch PDF link annotation
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/34496d30093f.pdfIn PDF document text
    • https://varemajog.weebly.com/uploads/1/3/4/5/134585454/8b5ab1f4e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5f8eccaa6b501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402740/normal_5f9b387c81b4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tobobowu/i_have_lived_a_thousand_years_genre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd19dac5-352b-486f-8e3f-facec7b4377d/sophora_japonica_benefcios_de_pele.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/44964623786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b1cadf-6e7f-4f9a-a9a9-f3fa55dad831/31912843395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5aa5f5-6ada-40de-ad15-96c7c9002a34/beautiful_disaster_free_mp3_download.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/analtica_web_definicion_informatica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4edf2429-dc50-44a6-af86-2c61642cc34b/hambo_unblocked_hacked_games.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20A 5096 bytes
SHA-256: 9910fb41bde954697766f1be2cd98bfe14b78716d06764e5677d2a619a02d8d2
font_01_sfnt_off0000c357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC357 10512 bytes
SHA-256: 87fe2d33793659aad254592f0896bac1ff73ff42d83cabbb867151371817ec37
font_02_sfnt_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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