Malicious PDF — malware analysis report

Static analysis result for SHA-256 0586452d3dea2e0e…

MALICIOUS

PDF

84.9 KB Created: 2021-01-06 13:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c7b1fd5cba9a355a0b681303f2492540 SHA-1: 363f340af95bedf4b2121a79c56bb0260f9c50f9 SHA-256: 0586452d3dea2e0e9663d17dd65decf5c78c94f4b6c48653ead3d3b5f409b023
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 domains commonly associated with phishing and malware distribution, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous suspicious URLs points towards an attempt to redirect users to malicious content, likely for phishing or to download further payloads.

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://trafficel.ru/aws?utm_term=rectangular+pulse+fourier+transform PDF link annotation
    • https://cdn.sqhk.co/renerolodepu/UlKAoQi/traffic_racer_game_download_hack_apk.pdfIn PDF document text
    • https://vilawapa.weebly.com/uploads/1/3/2/7/132740366/5861824.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/ibTPihz/train_taxi_mod_apk_unlimited_coins_and_gems.pdfIn PDF document text
    • https://wawukonuxoni.weebly.com/uploads/1/3/4/0/134095992/4867534.pdfIn PDF document text
    • https://foxaxefaga.weebly.com/uploads/1/3/1/3/131398491/fulidozufelipe.pdfIn PDF document text
    • https://texanajak.weebly.com/uploads/1/3/4/0/134018539/6153399.pdfIn PDF document text
    • https://cdn.sqhk.co/dasoxitif/SyLoRVx/61621829355.pdfIn PDF document text
    • https://nutarubanamu.weebly.com/uploads/1/3/4/5/134528768/972827.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/fenatagazise/vawinoxigasumabudu.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/fresh_snail_mask_sheet_review.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/jexagezizosiwojoxow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d887e7-f0e6-4b91-a565-8fc9df43bbc9/pajotaxoberad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef76501e-c105-4639-b5d3-282e3804281e/2489739156.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/cara_membuat_blog_gratis_lewat_hp_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lodunixodetum/intel_manual_vol_3b.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001161e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1161E 26540 bytes
SHA-256: 0d2da26adc077a93ddfd70ed314de132308fa4255b4405522efda0d55e2c403f
font_00_sfnt_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 5340 bytes
SHA-256: cbe0a9d47271256055f5947b0903987effb44dedf977f2d56055061ba38c3b6d
font_01_sfnt_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 12324 bytes
SHA-256: d506df289f1dac3453d0a83058e5a60510ab8b4186be072e277628dcaf4e47b5

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