Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ab0d6f39ac4549…

MALICIOUS

PDF

73.9 KB Created: 2020-12-31 00:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5378c12c8cbf3f9652f798d3330b55b SHA-1: 5374a1008f92ee71e42522ed230ab604d30ce93b SHA-256: f3ab0d6f39ac45491332b76d77c156cb5c086ec592b6fb84f6ba93ef60501a40
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with one critical link pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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/strik?utm_term=water+balloon+slingshot+diy
    • https://static.s123-cdn-static.com/uploads/4425224/normal_5fe35a3f35382.pdf
    • https://static.s123-cdn-static.com/uploads/4426073/normal_5fcdf1d881a20.pdf
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/moliju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/setikizo/93048146231.pdf
    • https://s3.amazonaws.com/fejenijovekozu/aashiqui_2_tamil_audio_songs_free.pdf
    • https://s3.amazonaws.com/purufiz/10289434272.pdf
    • https://s3.amazonaws.com/gotijejaj/tipobemunedekikebef.pdf
    • https://s3.amazonaws.com/mefonevimimix/87698658949.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/c._v_form_arabic_and_english.pdf
    • https://s3.amazonaws.com/puretulenuza/38677719434.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_off0000d5f8.bin
defc7494f7d147b04d4fcdb2f4b8a4715def2e1db7ad707e64f70276588490de
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 5128 bytes
font_01_sfnt_off0000e763.bin
d52a50335aa5e9a78024e9b2ce2d2c36e26dcba65b1aedf0a34372f963c789a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 10664 bytes
font_02_sfnt_off00010bc9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 4324 bytes