Malicious PDF — malware analysis report

Static analysis result for SHA-256 820de4cc983e68c6…

MALICIOUS

PDF

71.8 KB Created: 2020-11-13 03:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f867dbf7860e776e9389e35fd88e9da8 SHA-1: 1663a9fc707b6251d42a25ba8c645be0f8de7616 SHA-256: 820de4cc983e68c65b240949cad66aab65439a29200f100413661c9ec2cfe786
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://trafffi.ru/123?utm_term=friv+unblocked+games+66 PDF link annotation
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/5727526.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/dda22a8fba453.pdfIn PDF document text
    • https://nikotegonekis.weebly.com/uploads/1/3/4/6/134628666/gujilujodatilu.pdfIn PDF document text
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/7b7883.pdfIn PDF document text
    • https://bolififona.weebly.com/uploads/1/3/4/3/134316640/zepur_fumerofokuronom.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/rexezigiwer.pdfIn PDF document text
    • https://gelekale.weebly.com/uploads/1/3/4/2/134266195/fitumo.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/bisute/world_important_days_list_download.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/wuzizaziwowenenew.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/bizudekurovedanum.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/english_mark_darts_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/86901907369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f539689-8aae-4e2e-839b-ebc69c4146f4/65931419378.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/copper_air_fryer_basket_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c211717-9d73-4f59-970f-243e57ed9a14/jedidudonovi.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/2501640894.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_off0000d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 5632 bytes
SHA-256: 1d7e9d55aa3c28c6b663ab62c2fb048a47e09f8ad1b74620b54e0104ea67a641
font_01_sfnt_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 11396 bytes
SHA-256: 91f6d7d857419c78d9301d98206400a2ed2ca2a98057dbbcfcf3bb63ea4105b6

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