Malicious PDF — malware analysis report

Static analysis result for SHA-256 1879301f619419b7…

MALICIOUS

PDF

72.7 KB Created: 2020-11-23 23:02:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30e47ee5207ce36135d5ae0660daebe0 SHA-1: 12d4fc3a78d7c439c0d4b47aa6a42340b78ed3dd SHA-256: 1879301f619419b7e221410cc05a7163fda783bdbaf3c0fdb9d0d3510d279f73
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external links, many of which point to a domain associated with link farming. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/123?utm_term=palin+snl+russia
    • https://cdn-cms.f-static.net/uploads/4477367/normal_5fae165bb87d6.pdf
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f88243388018.pdf
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/4489358.pdf
    • https://sukojafura.weebly.com/uploads/1/3/4/6/134632918/8261006.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b290bc9f-9b29-465b-83f5-eb9ce6353c08/70507159759.pdf
    • https://uploads.strikinglycdn.com/files/65ce3319-fc36-4d44-bad4-5a2fc455efbe/how_to_install_javafx_in_eclipse.pdf
    • https://s3.amazonaws.com/sakaburepagase/zaxozoxog.pdf
    • https://s3.amazonaws.com/jagux/eccentric_turning_operation_on_lathe_machine.pdf
    • https://s3.amazonaws.com/mamukawaxatali/mount_jordan_middle_school_hours.pdf
    • https://s3.amazonaws.com/tezofuretejom/ain_t_it_funny_song.pdf
    • https://s3.amazonaws.com/rizezobabub/behaviour_management_plan_template.pdf
    • https://uploads.strikinglycdn.com/files/fae5c31e-fb35-4463-af48-da899a45d328/mcat_physics.pdf
    • https://uploads.strikinglycdn.com/files/528a89f6-085b-471c-8976-c68b86b3da92/48860237993.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e2.bin
25ad10f107c10616a1578ecf3d15e52f3059bcc0ab0b3fc1d2ec192a23a1ec53
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 4680 bytes
font_01_sfnt_off0000f2d3.bin
59ea1595bd508a593cd7500c1dea53b2e60695eba89b67c6a6177a3b89e31fdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 10452 bytes