Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a905139d29635e…

MALICIOUS

PDF

73.5 KB Created: 2021-01-06 08:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7ca8901a04ff2e3cfe584d3326520adb SHA-1: 941fab0d069cd58bcd4b8da091745fc105dda26f SHA-256: e7a905139d29635e9b75be5b1e8c9b78305244f8119cc22a356db03eb54892d7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external URIs, 'https://trafficel.ru/123?utm_term=clogged+pores+on+nipple', is suspicious and likely leads to malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan distribution attempt.

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://trafficel.ru/123?utm_term=clogged+pores+on+nipple PDF link annotation
    • https://luvoseguz.weebly.com/uploads/1/3/4/6/134665560/74896.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/jgifFjc/grande_iced_matcha_latte_with_almond_milk_calories.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/nalifij/likibij.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/attestation_letter_format_for_student.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8750e3d6-64ab-4228-ae2d-2c54b9c7b0ea/jezegexifulekoge.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/patusarolodopo.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/adobe_photoshop_premiere_elements_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/50476043203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68afceba-7801-4685-a7ee-333c83b402ee/58371273264.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/dagatijununa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a84d92-3cf4-46cb-badb-6724b0f28966/86009234882.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/nawadapesukudodopopelib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd987773-1c0d-4a54-b21f-97e910c05f34/kitchenaid_kdte104dss0_dimensions.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_off0000e5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EA 4820 bytes
SHA-256: 9a7fa7c173731b4d35eaacfe1e77ece3899a270e1dcc527b6e20adc15c5efa2e
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 10340 bytes
SHA-256: 29c89ee3c993db6d55c2fe99d04d124d9f197faa4eebbe49f0e5606598fe8d10

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