Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f17be1cf401abad…

MALICIOUS

PDF

73.4 KB Created: 2021-03-11 22:27:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 93980f3bd4238c46ed20d044635a3de0 SHA-1: 5ca4b9d1fb6603f6543d202a59ab40d34dcd7cb3 SHA-256: 9f17be1cf401abade48bf6b6b53075a3ef339f7e98fe964ed8e62e1b7d2ab889
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a common tactic for link farms and phishing campaigns. One of the extracted URLs, 'https://dafemum.ru/wix?keyword=just+want+to+praise+you+lyrics', is flagged as a malicious redirector. The ML classifier and ClamAV detection further support the malicious nature of this PDF, indicating it is likely used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/wix?keyword=just+want+to+praise+you+lyrics In PDF document text
    • https://static.s123-cdn-static.com/uploads/4450624/normal_5fcfa63374e58.pdfIn PDF document text
    • http://nunupefaz.iblogger.org/benezoril.pdfIn PDF document text
    • http://tojumuwuluso.iblogger.org/51906066762.pdfIn PDF document text
    • http://mafonofolifeda.22web.org/bittorrent_filehippo_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378153/normal_6006d377e7a45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413696/normal_60095f5ee7793.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_fd85b07df51942f1ae971b9bf10f9128.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bubeto/desktop_wallpaper_free_for_windows_8.pdfIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_f419d386ae4f429e841713d90aaa6f6a.pdf?index=trueIn PDF document text
    • http://dagajevefud.epizy.com/perioperative_antithrombotic_management_guidelines.pdfIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_5f9aa642bb1c48cd9dc57c529cc1d4ad.pdf?index=trueIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_0fc502afedec4f098e2cda61bd31bb38.pdf?index=trueIn PDF document text
    • http://tepisivud.epizy.com/66225722270.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_f3b81a04672946c29adb0ed11458e745.pdf?index=trueIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_82f0b9b436ec4c168522503c34b6aeeb.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_b6c34f3ed5ad47d499f94f88361897e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiduro/do_trevor_and_tessa_get_together.pdfIn PDF document text
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_358ebf616aed48058989366e9db9adc8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/driving_school_near_me_manual.pdfIn PDF document text
    • http://roxegubipav.epizy.com/49425496973.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_c3f77082031940238256826f5a25adc0.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 5112 bytes
SHA-256: e17673978727fb3cede5e3fb4077fa232904028e026544df32741e0026b486cc
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 10136 bytes
SHA-256: f8163a89f3b9a4e1c2bfa934f77ff28ffbadc7178c2161ab2c489469d53c8d95