Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87d2c09e4f9efc2…

MALICIOUS

PDF

79.3 KB Created: 2020-12-22 19:32:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf573c24ed287e1a38744625b84e95bd SHA-1: 90e99174d3537bb5150291086258354b6eefd4d6 SHA-256: a87d2c09e4f9efc2ed723d01f218fb6cd6365537a50a758be71ec9d58580ec8e
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a redirector and a link farm. One of the primary links points to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links.

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://cctraff.ru/aws?utm_term=lm358+audio+amplifier+datasheet
    • https://posolefuriw.weebly.com/uploads/1/3/4/3/134374222/jimopetosepobi_rumud.pdf
    • https://natulawud.weebly.com/uploads/1/3/4/3/134309077/rovexe.pdf
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/2984568.pdf
    • https://cdn-cms.f-static.net/uploads/4403818/normal_5f95fbf0c512c.pdf
    • https://vilemanunopabom.weebly.com/uploads/1/3/4/3/134317174/416617.pdf
    • https://lizatupapej.weebly.com/uploads/1/3/4/4/134401074/3773829.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3f0b2278-c595-432e-b3f7-7a5859ba7a88/61612504254.pdf
    • https://uploads.strikinglycdn.com/files/e40fb157-b71c-4f7a-9990-d56736af9ea3/nerf_rival_manual.pdf
    • https://uploads.strikinglycdn.com/files/26f8a9df-afe0-4463-856b-e5b70ff84ead/godizuwosofazirukopatiga.pdf
    • https://uploads.strikinglycdn.com/files/c793e129-bb73-48c5-aa96-205bf1174fe3/xajikuzaxoramomapozojesi.pdf
    • https://uploads.strikinglycdn.com/files/bde5cfe3-a4aa-4dfc-aedf-852015ce280a/culpa_mia_mercedes_ron.pdf
    • https://uploads.strikinglycdn.com/files/28295456-ff42-4b8b-9a9d-47118f8cde60/venawaxakuduximuf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb2.bin
69a493e75ce8ad4b432d45dc9cd7a0a05202046bb0fa28346a5ed585828604ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB2 5704 bytes
font_01_sfnt_off0000f1f2.bin
97b264379eb968f2f816f513dbd86ceaf8840f8d2e76bd6209dae73fd4471a7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 12252 bytes
font_02_sfnt_off00011aff.bin
813ea553b383b7c6403acaa04b5068532cc23c1b41448bc4e71f1b4196020833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFF 16060 bytes

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