Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77a84548ff72e93…

MALICIOUS

PDF

75.7 KB Created: 2021-01-08 08:06:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5e4f29f96bb0471d53851f09e27bde9a SHA-1: 15b1da51eedfcba29bb5d3fb8ae9b7029fcb2fe4 SHA-256: e77a84548ff72e930c63b18153f2110f8083f1fbf6fe7d985f8831404b86ae56
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to suspicious domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://traffset.ru/123?utm_term=skateboarding+made+simple+trick+list PDF link annotation
    • https://ximilebikunupi.weebly.com/uploads/1/3/4/8/134875253/borexajakewi_tevupizidomaw_dusavozukiwib.pdfIn PDF document text
    • https://gozekukapitob.weebly.com/uploads/1/3/4/4/134443516/81bea10b77a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484994/normal_5fe62540e03ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393911/normal_5fd69aa66eaa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_5f9cd06b39ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416326/normal_5f9c34d059b68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408601/normal_5f9e0eb5cec47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490250/normal_5fb80b42b67d4.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/tapelu/catia_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/tv_guide_for_st_joseph_mo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e84c2d-740f-4380-9929-ec89ecb6d219/sicko_mode_travis_scott_clean_versio.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/the_turning_2020_123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2317f6af-018d-4430-87bb-465e51ca92bb/ultrax_labs_hair_surge_vs_rogaine.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/download_gta_5_apkobb_data_for_android.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_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 5700 bytes
SHA-256: 3d3199f2199cb993dec58a1b5c75f644c76bb8eb172d443a3129f26e9f26e356
font_01_sfnt_off0000fda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 10552 bytes
SHA-256: b854a3a073da36c900a0b116f572270ad1a6db593ea08dec7c0d6a2da0cb6004

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