Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0bff57710317b5…

MALICIOUS

PDF

72.3 KB Created: 2021-03-01 01:58:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6e7eb3968ad1146d661ee760d164af7d SHA-1: 736465060faf02ec3715d97b4a1464a7d5f552fa SHA-256: bd0bff57710317b5b5fc4336dcdb888d8867cb24acd5106a1e6c46d3319c3855
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to S3 buckets and other domains, which is indicative of a link farm designed to distribute malicious content or phish for credentials. The presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, along with ML and ClamAV detections, strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=ninja+blender+target+australia In PDF document text
    • http://onlinesos.tech/power_book_2_ghost_season_2_castpncmy.pdfIn PDF document text
    • https://pudozewo.weebly.com/uploads/1/3/4/3/134311846/9d05b05.pdfIn PDF document text
    • https://cdn.sqhk.co/ferudati/r2khjgj/91179061620.pdfIn PDF document text
    • http://it50off.pro/the_burnout_society_free_downloadp1xrs.pdfIn PDF document text
    • http://vbnmcxz.xyz/how_to_replace_lg_glass_cooktop89mxq.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/a1ymKvK/life_list_bucket_list_movie.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/lyrics_something_just_like_this_otc.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/bipepezuwed/bunny_game_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/mujigemogulodamewer.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/56255844868.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/attachments_rainbow_rowell.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/baserimizulapaxituga.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/mosexubopobupig.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/lagu_abiem_ngesti_buta.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/tutamobefogefogike.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/liwepa.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_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 5180 bytes
SHA-256: bfc5cffc0e98d55a858fa6abc06d985d97ac74367d48c49dfb76adcda730aae4
font_01_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 10704 bytes
SHA-256: 5feb9c93bcdb29bc82e824e3debf48ca3749ee2cd0e922f96253ebd140204b87

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