Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92b1d324c93c753…

MALICIOUS

PDF

122.3 KB Created: 2021-02-22 18:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9ebe028489006c28c01c02811423dc33 SHA-1: 510141acd2e187ab17d28888961fa8088715b881 SHA-256: d92b1d324c93c753f73bdbe3899be04ad7a06caa5b46132e20f67ee2968e646a
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 pointing to S3 buckets and other domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs 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://jacksth.ru/123?utm_term=what+is+sonic+ocean+water+made+of PDF link annotation
    • https://kukutapiroboj.weebly.com/uploads/1/3/4/7/134712573/7234570.pdfIn PDF document text
    • http://saxamem.iblogger.org/gold_platform_shoes_70s.pdfIn PDF document text
    • https://banatili.weebly.com/uploads/1/3/5/3/135314160/8996984.pdfIn PDF document text
    • https://pafirolexorawu.weebly.com/uploads/1/3/4/6/134612045/vupukegebisida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445128/normal_5fd7f2493c142.pdfIn PDF document text
    • https://nakaporona.weebly.com/uploads/1/3/1/4/131438848/1169218.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/gmcC75r/starz_on_hulu_promotion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_601fdc0f5c43d.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/ifpjgxZ/zosekapupuwabig.pdfIn PDF document text
    • https://cdn.sqhk.co/duravukikemo/hcXOgis/99304718229.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/bones_season_8_guide.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/lopadivupudexa/power_transformer_us_to_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/16866003429.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/mubotiwaniputirafegam.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/best_corded_telephone_with_answering_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/19834699104.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/kukologilaj.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/future_simple_tense_worksheets.pdfIn PDF document text
    • http://karelovaluz.epizy.com/bogoguxavegujebuf.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/all_eyez_on_me_album_cover.pdfIn PDF document text
    • http://xafexepov.epizy.com/26932671606.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/heterogeneous_catalysis_in_industrial_practice.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_off0001a151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A151 5332 bytes
SHA-256: 3413cb3f2ed7f817d7fb165935f5da1ae2d3da1dbff5833ed4a58696b806bf06
font_01_sfnt_off0001b35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B35E 11852 bytes
SHA-256: c468dc26672148f418e062858a92fbca06116bad7f8012f7eba53289f97bc4f0

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