Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0c2a0cd5d6a6aa…

MALICIOUS

PDF

91.0 KB Created: 2020-11-20 03:00:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2294fe102da13194ebe45c70803d74db SHA-1: dc572e439d6f6a69adbec680603e1dd8a5e56eaf SHA-256: ae0c2a0cd5d6a6aab21a1b10561ea7e54f328bd603b1ebaed5693dbe6050d1d1
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://traffmen.ru/aws?utm_term=acknowledgement+of+service+form+divorce+m6 In PDF document text
    • https://zesukixugedun.weebly.com/uploads/1/3/4/5/134593530/52e4ce43362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_5f91fc91409db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_5f8d707709482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f8765b8c0742.pdfIn PDF document text
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/nixitegilamije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e23ace2-c705-45f3-85a0-9817e0323115/40681949557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b89f796b-357f-4f71-bb4a-81296556dc9d/97051979312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6c3ecc-4fb3-4738-ae34-55bb07bafb0e/65005019447.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/lujixorusasirerigofol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a658676c-1b61-4978-94a0-cd8c7e6b7045/farmers_dynasty_money.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 5196 bytes
SHA-256: 450c4c103f956b40ca2364c4146be46def9e05531564596d9c0f287c6c7e8c7e
font_01_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 5492 bytes
SHA-256: c47643aa67def5292d74e7d8218c8ef24351cd191d2a90148f3a39239fbbd2ce
font_02_sfnt_off00011e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9E 11584 bytes
SHA-256: 6c5cd77fda190eb30b9589301903a4487ce25509c3c84259f2a73200eaa16fc5
font_03_sfnt_off0001455b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455B 16684 bytes
SHA-256: fe1ca6a691315ef32827512bb86cd3188d7c30cfa02bd4559714794831c9b14a

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