Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16c28ad7f5614be…

MALICIOUS

PDF

61.1 KB Created: 2020-11-11 14:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9046e888bb843122e303c790cffd9ea9 SHA-1: 3a7e1df9d21111212d9588e17cb124f9bea6ca89 SHA-256: d16c28ad7f5614bebb08b025be42a25d1bf4166827b87283a0bd2f0036915ec3
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 significant number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://trafficel.ru/123?utm_term=abastecerse+en+ingles', is likely used for phishing or to redirect to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=abastecerse+en+ingles PDF link annotation
    • https://najutumivuzobo.weebly.com/uploads/1/3/4/4/134473994/xitatonokuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500438/normal_5fab6f27ef972.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/susopuzupure/buku_agama_islam_kelas_11_smk_kurikulum_2013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/949c5434-8620-4c22-89ed-d61ca277939d/39333652110.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/sezazilawuvoboginedev.pdfIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/salinger_seymour_an_introduction.pdfIn PDF document text
    • https://s3.amazonaws.com/kimoweworape/toxaxijimawimukax.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/44617197033.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/45486885009.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/pubg_mobile_hack_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed0da9c7-2bd2-4151-a7b2-68b9b7579999/90314070892.pdfIn PDF document text
    • https://s3.amazonaws.com/tefelaj/xirivejegarurikajan.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_off0000b526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB526 5096 bytes
SHA-256: f8aad73866f3ca3cbcc188befedf26aa43b76e6edbb2d127933cd4da090960ba
font_01_sfnt_off0000c68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68C 9992 bytes
SHA-256: e9f4ec3257849f1762c4ebe37a7a9648536b18c922622beba4457a3748a07446

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