Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab1aaced127f5e4…

MALICIOUS

PDF

79.5 KB Created: 2020-12-22 21:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d7789ba1980220605584f06bfd2beaa3 SHA-1: df2deb0e9a032df8382d4526aa3e188f7b8bc30a SHA-256: fab1aaced127f5e4306724a4d599fbadaafcfe668eb96da191b1da65f1e4b067
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, suggests a lure related to 'free printable piano sheet music'. The presence of a large link farm and a malicious redirector indicates an attempt to lead users to malicious infrastructure, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://ggtraff.ru/aws?utm_term=free+printable+piano+sheet+music+disney+songs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4498345/normal_5faf8be624a33.pdfIn PDF document text
    • https://mipolapepel.weebly.com/uploads/1/3/4/3/134395859/fofevawajuwawigib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf54a1af5bf52c326a256/1606219082839/dhgate_payment_verification_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/663e7e8b-57d7-432c-b873-2d5f0b6e1aa3/13353270103.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2f0f6f7cf8c7540383d7d/t/5fc8ed3bdabc7d38e62860a6/1607003453464/10739436618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80311ef1-5c8d-4cce-b5e6-d011df49c7a5/15261065423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/826a9850-e800-4f8f-b4ef-b3ba0dd12b93/5040072427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917188f6-74fe-408f-99df-6d80fd57ac02/zudobozitegivegudakujefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cdf7034-738c-4262-a5d7-7bbeb986fc5c/fugokojevof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0b6ae3-f48e-49fe-9adf-ea3d24fa97b6/sherlock_holmes_in_washington_1943_youtube.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 5684 bytes
SHA-256: 2366806af5b2188f5c4848182de0139c453e688f8d019fd213b52196deb6d8f1
font_01_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 10808 bytes
SHA-256: 0e8116d5f65d8ce875a69ac2dbd60fc358edbd12dabeedc6b18687c4c52b0486
font_02_sfnt_off00011bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 16100 bytes
SHA-256: b330339415d7fa9c1b652c1fb2a052ec06569061b7b71506ab53161dc9b94742

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