Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38aff493d6b47b4…

MALICIOUS

PDF

70.4 KB Created: 2020-12-06 21:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f82dc5a83e6e37d00858fffa88614192 SHA-1: 97e77bc7e98ced0379bc2748e1d40e0c50dded96 SHA-256: a38aff493d6b47b4c566443dbfa61d27ddf025ce1f85dc0d72d0b3b9382577f1
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document that contains a lure related to forming a residents association, but it also contains numerous external links, indicating a link farm or phishing attempt. Heuristics indicate an advance-fee scam and a high probability of maliciousness, corroborated by ClamAV detection. The document likely directs users to malicious external sites for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=how+to+form+a+residents+association+in+kerala PDF link annotation
    • https://fawimerena.weebly.com/uploads/1/3/4/6/134630635/f27e49177.pdfIn PDF document text
    • https://nopiroradonumiw.weebly.com/uploads/1/3/4/4/134401961/920e1ebc.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/vedexajawo/70625974651.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cf44e5c7695ca99b2c1d/t/5fc3b9ed6457125654ada492/1606662639225/traffic_slam_1_agame.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc792f4c89b935f15e2e9e3/t/5fc874da8bd779356751f9e3/1606972637384/aesthetic_wallpapers_blue_and_purple.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/topology_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/jesuzurut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35959110-78c0-4e56-af09-1267d1ee38a7/locuras_de_amor_en_las_vegas_latino.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3979ae5c7695ca9ac7d5a/t/5fc6277c3485235c8698c9d0/1606821766487/54717426587.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/del_norte_county_sheriff_s.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/niwaxuma.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_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 5284 bytes
SHA-256: 6998fce2c92a86527786fa4175799c4ddec8550d028adf706de828d7f1a6a9c3
font_01_sfnt_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 10880 bytes
SHA-256: 0cb12043d85c3245e0efc9b93016176ae671da6f6c34f176005d88e8452b9352

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