Malicious PDF — malware analysis report

Static analysis result for SHA-256 8424c5f05d25360d…

MALICIOUS

PDF

71.9 KB Created: 2020-11-22 20:06:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 791e4256a3ae12960d7150ff0bbe4b4c SHA-1: 772836fcdaa2c57c05729261d89a3e345f50def3 SHA-256: 8424c5f05d25360d465cd655bc4ae7b956a6eb5cba29e5b7126b653dedd1ed83
214 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs and is flagged as a malicious redirector and a link farm, indicating an attempt to lure users to malicious sites. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution vector. No scripts were extracted, but the presence of numerous links suggests an initial access attempt via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=oracion+del+justo+juez+hombre
    • https://voletiga.weebly.com/uploads/1/3/4/5/134501602/wotoxoxodikenax.pdf
    • https://cdn-cms.f-static.net/uploads/4474998/normal_5fadc324e2a92.pdf
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5f927a874af14.pdf
    • https://cdn-cms.f-static.net/uploads/4389586/normal_5f8ebaaba9075.pdf
    • https://cdn-cms.f-static.net/uploads/4450141/normal_5fba1d466f42d.pdf
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f90e5da983d6.pdf
    • https://cdn-cms.f-static.net/uploads/4369912/normal_5f9c06542036b.pdf
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f9d6346dd75f.pdf
    • https://cdn-cms.f-static.net/uploads/4374848/normal_5f9737ffe6468.pdf
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5fa567b3bf330.pdf
    • https://cdn-cms.f-static.net/uploads/4379387/normal_5f91cf030e13a.pdf
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/974d9.pdf
    • https://cdn-cms.f-static.net/uploads/4424037/normal_5fa7b474c1c66.pdf
    • https://cdn-cms.f-static.net/uploads/4453334/normal_5fa6819ebe078.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdfd.bin
721fd39e2f38f3a922ff50d0c9b6e8e1f23ea13bdf7a1b50c0b48ce4c96f051b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFD 5356 bytes
font_01_sfnt_off0000e001.bin
ba8a8e3e91f0c5dc268173eb0a27155c053a352ad7279aed3e8e04e11b1ccc70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 10700 bytes
font_02_sfnt_off000102cc.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 4324 bytes

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