Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db11edc7e3059cd…

MALICIOUS

PDF

94.0 KB Created: 2020-11-23 14:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d15b7a57bda8e375713094cde0ac7a4b SHA-1: 905b2e96564112cf7e7af5f5f9cc3be7eae380bd SHA-256: 8db11edc7e3059cd9b28282e03cb00ed3a77fa4db526b9f657f334adc1f897a5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?utm_term=cta+bus+map+55 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466153/normal_5fa715d89be2a.pdfIn PDF document text
    • https://jupovibofekek.weebly.com/uploads/1/3/4/4/134490290/narofobu.pdfIn PDF document text
    • https://keruzexutebimoz.weebly.com/uploads/1/3/4/3/134310977/voxovajufibimamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f8705e580f77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5fb65c9d98cca.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/418af759-7326-4fed-860c-3a66d9de90d3/zosazugijibuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15861606-b54d-4094-9bd6-232b283eeea6/74337861583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/737318ad-e748-47c5-b2a7-b41d537e1e87/wazoviwidametawilunek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ab4bef-ee95-4329-95a1-7f564a8dccb0/23989001910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7556dce9-880f-4d5a-94fc-f6dc2a65af1d/45136036625.pdfIn PDF document text
    • https://s3.amazonaws.com/goporo/morse_sewing_machines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0dd43f5-ea33-4019-93e7-f39ef0727077/powavurabipusadegawopaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb62a0b-d363-4344-b3c3-6de06ac60dfe/mckinsey_problem_solving_test_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a354ae-dfb5-4a79-b280-6a03afb49544/xakeduzapavunadubine.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/71417904250.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_off00012649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12649 4624 bytes
SHA-256: cae56aef6ad67f05d10158c0f07926e5a5d92e8d2cb7c8d894974b7118779b10
font_01_sfnt_off00013600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13600 12524 bytes
SHA-256: b8ce8d749332034920fe835543b15cb122592edb22e702259f9a7ca5b5a97478
font_02_sfnt_off00015d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D24 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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