Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df6c1f763a63336…

MALICIOUS

PDF

70.0 KB Created: 2020-11-21 23:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98cbd02bc825709e8552bd6d05acb2f7 SHA-1: 160b21ea130b678bbd5d1a78b61f6f40ffe8c3a1 SHA-256: 2df6c1f763a63336eb600699a3d423867260b610225c4983d5dbb3995414f721
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=thanh+cung+13+trieu+truyen
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f8776b519fbd.pdf
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5fa77a208e658.pdf
    • https://rukiwopuxe.weebly.com/uploads/1/3/4/3/134340105/vexos.pdf
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f95e5723b27f.pdf
    • https://cdn-cms.f-static.net/uploads/4498992/normal_5fad483b89eaa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sezewu/super_slime_simulator_apk_download.pdf
    • https://s3.amazonaws.com/petuzutemixuvod/ciclacion_de_monosacaridos.pdf
    • https://s3.amazonaws.com/woxojuxafopuv/l_douglas_wilder_middle_school_henrico_va.pdf
    • https://s3.amazonaws.com/nabifovu/66947089269.pdf
    • https://s3.amazonaws.com/tutapaxi/30145492378.pdf
    • https://s3.amazonaws.com/zobuwubedak/rakubupagesabef.pdf
    • https://s3.amazonaws.com/sezewu/webog.pdf
    • https://s3.amazonaws.com/julaxel/avakin_life_hack_app.pdf
    • https://s3.amazonaws.com/henghuili-files2/24791939829.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c988.bin
9ad780800a9c1e84c7b541fb8ba32605bf1a951e64b32caed037932c5c4f3cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC988 4892 bytes
font_01_sfnt_off0000da27.bin
a0577d83e2e7e3280ace68b354137751ebd4b2b02291788decc26273647dfeee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 10328 bytes
font_02_sfnt_off0000fd38.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 4324 bytes

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