Malicious PDF — malware analysis report

Static analysis result for SHA-256 5790ccca0e613148…

MALICIOUS

PDF

70.5 KB Created: 2020-11-18 10:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 606c6e2bfcdf246996e631cd0f4cac67 SHA-1: b617d082b96fa2e3f57cc3f19648a8effe2fd66d SHA-256: 5790ccca0e61314895c91ff77617849f049f5f23c4166421a98e845d2ada109f
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it uses an image lure linking to an SEO redirector for phishing. The embedded URL, https://trafftec.ru/aws?utm_term=dialysis+technician+resume+format, is likely the initial landing page for the phishing attempt, disguised as a resume format to entice downloads.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=dialysis+technician+resume+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379612/normal_5f9ade97901ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_5f9ab867be171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5fa86f3e7b10a.pdfIn PDF document text
    • https://visajemilami.weebly.com/uploads/1/3/4/2/134265887/xaveref.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6b3ca5ac-4273-4a5d-88e9-5df8b5c40eb8/62886146501.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/onn_wireless_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c539053c-c94b-4554-b092-a84a906f7427/17944620588.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/47791346731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c921bb9-79f4-4187-b222-7234592cb433/61419799387.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/kukajilofenenegisej.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/29830831719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39f675c-4728-4c9f-b0ae-5b286fc1ab80/trek_incite_9i_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/lagad.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/32174135984.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/cu_boulder_campus_map.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C0 5104 bytes
SHA-256: 7449efe076db959e3cbebafc1b609cf392fbee90d788e389596f065d7cf7f78d
font_01_sfnt_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 10620 bytes
SHA-256: fbfcaba3d384f1924f9ec00ded4a1b11a49ddc154e7e5528a18890daf7e04946
font_02_sfnt_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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