Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a33cdc1278998f9…

MALICIOUS

PDF

75.4 KB Created: 2020-12-23 10:11:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5d20cd8967597ed5396d2717c956d3f SHA-1: d9cab53f73b5c82ca076bcbc48c8a6b1591aab5e SHA-256: 3a33cdc1278998f9a3dbbff1d106430c6897c631335cd77094dca1cf56be3ef5
214 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. It contains a large number of external links, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ggtraff.ru/aws?utm_term=xamarin+forms+listview+data+binding+example
    • https://cdn-cms.f-static.net/uploads/4384650/normal_5faf06ad07766.pdf
    • https://static.s123-cdn-static.com/uploads/4452400/normal_5fc5c7e33e42f.pdf
    • https://pozuzedik.weebly.com/uploads/1/3/4/6/134668333/gezodi-jiburinumiged-lavudam.pdf
    • https://wirufaxiferid.weebly.com/uploads/1/3/4/5/134599318/sometupupud-dixarogupin-zozozew-jukatotar.pdf
    • https://cdn-cms.f-static.net/uploads/4388048/normal_5fad8d96b9bd6.pdf
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/696a19fc4ef30c6.pdf
    • https://tadafami.weebly.com/uploads/1/3/4/3/134386911/giriken.pdf
    • https://cdn-cms.f-static.net/uploads/4393916/normal_5fb2c07b971d8.pdf
    • https://gusabowusido.weebly.com/uploads/1/3/4/6/134652741/9771133.pdf
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f95ed4986c28.pdf
    • https://static.s123-cdn-static.com/uploads/4418567/normal_5fe06f9ab57e1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/07d8648d-3cdf-4247-a052-d7aaa76c7323/pifomudamaxer.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c44c.bin
ec7b02cc0a6707c6d51d8db640cbe116a848acc3713a1055ec423a990765db9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC44C 5484 bytes
font_01_sfnt_off0000d6ea.bin
71a61c4eac2492f24886f054477019d20c5b89f1e3a16047296141058bbc29c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 10956 bytes
font_02_sfnt_off0000fca2.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 16312 bytes
font_03_sfnt_off0001122d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 4324 bytes

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