Malicious PDF — malware analysis report

Static analysis result for SHA-256 f668a3335bb44d6c…

MALICIOUS

PDF

81.3 KB Created: 2021-01-07 21:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 629bc1e334705a4c28da3afd204bf2dc SHA-1: 7324c42fe15529bb04c64ef747fb795fd534f967 SHA-256: f668a3335bb44d6c762180087f3339e8dd545a64b16f7b96a9a8bf9643dd7c7f
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL that appears to be a download lure. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. The presence of a 'download button' heuristic further supports the phishing and download lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffset.ru/aws?utm_term=whatsapp++for+android+latest+version+2017 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488101/normal_5fc7521bcf6e6.pdfIn PDF document text
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/7da2ee1.pdfIn PDF document text
    • https://joxuripuziw.weebly.com/uploads/1/3/4/2/134266010/bigebok-buvele-biwezedetix-gagupubebuleko.pdfIn PDF document text
    • https://lagomumudalo.weebly.com/uploads/1/3/2/6/132681699/1570297.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/leguvefu/coronary_heart_disease_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/51023157010.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/dometic_microwave_oven_cdmw12w.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a55a82d-3cfb-41de-8f49-f04418e095ea/tonipamipafirazobutane.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/16257126436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec1899e-4f97-4bb5-8f20-fc1d46dbe9ee/pobolopanojujoroma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3effd17f-aa9f-4122-bfd0-02159376f067/26331358397.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/14067562651.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_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 5608 bytes
SHA-256: 9e140f21181621c1816ccfd9bd4808aaaa32b83b251be7da934308ef760d4069
font_01_sfnt_off00011224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 11312 bytes
SHA-256: f347191e7b941b707da289e9c6ff3fac42b20f9a697255e225c0cfd0a84d228b

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