Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a107f328722b3b…

MALICIOUS

PDF

76.4 KB Created: 2020-11-20 23:25:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29a12261eb2ad1f75b70c1544de852a6 SHA-1: 9744ff008230c184bb928ea85069607ff537157b SHA-256: f2a107f328722b3bb55e84aa0b0600ef632f8973cc9572f6b8b693307f6d3d98
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of malicious links suggests an attempt to redirect users to phishing or malware hosting 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=cold+steel+machete+south+africa
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/nifit.pdf
    • https://wejuvizir.weebly.com/uploads/1/3/4/3/134395749/481588.pdf
    • https://gumopukuzi.weebly.com/uploads/1/3/4/4/134481114/93a0d.pdf
    • https://rapusixub.weebly.com/uploads/1/3/4/6/134631860/8355859.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sizadagazagaj/arcuate_delta_formation.pdf
    • https://s3.amazonaws.com/tugumeb/area_of_triangle_using_sine_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/9bf7813a-9fc0-4925-b4c6-5a3aa7f6fff6/lakenul.pdf
    • https://s3.amazonaws.com/debamijizozexo/telugupalaka_avatar_movie.pdf
    • https://uploads.strikinglycdn.com/files/8826ee7f-c4ac-4666-8181-505f07c1523f/87708430622.pdf
    • https://uploads.strikinglycdn.com/files/36922c7a-7d37-45b4-8d3c-ec4698eafb7e/27063045440.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/android_studio_shortcut_getter_setter.pdf
    • https://s3.amazonaws.com/pajukovuxetu/53288673799.pdf
    • https://s3.amazonaws.com/rerinago/11726285402.pdf
    • https://uploads.strikinglycdn.com/files/2b2105bf-8aa7-462f-889e-9fb98603bb64/jofipefiveveruvuza.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f8de.bin
6630fb6ecaf11bc55650fd08620c1bf6ca3e2a511c63c81c76a5744cece307d0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF8DE 25504 bytes
font_00_sfnt_off0000c2aa.bin
9a83752e141d434aedd34df2ed65a677a740bcc9a9471931f99bbecde1de5abc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AA 5168 bytes
font_01_sfnt_off0000d409.bin
7537607201b1340bc12ea97f4dfbded6d1b1a143ed2faeb4c31909421e47fd96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 10708 bytes

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