Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51ea25fad1f92b4…

MALICIOUS

PDF

70.2 KB Created: 2020-12-28 17:36:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b16c65eefc4a127bd8576387bdeb286e SHA-1: ed3bf5d20922d0ad8ad73a4ccbbec3859a9ab7ec SHA-256: a51ea25fad1f92b44f433dc726018ae7cdaf94efa9966df4ca80049d1dac7456
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary technique being Spearphishing Attachment. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation scheme.

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
  • 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://trafftec.ru/aws?utm_term=super+junior+ahora+te+puedes+marchar PDF link annotation
    • https://bajazari.weebly.com/uploads/1/3/4/3/134314741/vuxizosegupuwawusuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_5fb3f77009ce0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_5fa0017def5d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476567/normal_5fab3c1e56ae4.pdfIn PDF document text
    • https://kunulidozejenu.weebly.com/uploads/1/3/3/9/133997834/a24819231362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478703/normal_5fe6403e888f8.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/c6hfXib/fumixexuxoxeronusavo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490251/normal_5fe1ca3d18393.pdfIn PDF document text
    • https://cdn.sqhk.co/susotizakaxe/9jhWaic/walowipiti.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/netinuwa/nowevonitito.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/bo_staff_training_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54003199-1a90-4d6c-9907-bec7c9faeb05/dajizedapagilegibuwekewu.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/bpops_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e4b44f-3b4e-4704-a321-9775538f97a9/proform_stride_select_825.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/namogiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37c5852-250a-42cf-9f54-d3d0dcfe4c28/mmd_motion_dl_feet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1b15e7-95ca-412b-8425-e066f248623e/west_bend_microwave.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/berlin_station_season_3_episode_4.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_off0000d189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD189 5460 bytes
SHA-256: 6c7a55303dce67f78f14b3dc2544a4d7f5958b0a354645aac5c68ea498f9896b
font_01_sfnt_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 11632 bytes
SHA-256: 300fdf2d55dbc18c507c473c007a8140d5539acb90b43f371ede27378a9c86e6

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