Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61e9fd3b73f8fa0…

MALICIOUS

PDF

76.8 KB Created: 2021-02-10 14:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bd5d93171c00b0ed7a5c76a2a729047 SHA-1: 52931a0a4194510ad6cf4cb04d11d8006665bb65 SHA-256: b61e9fd3b73f8fa05b891b32c8dfe66bae5a465bd3422e55e785f40f2a26392d
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, with one pointing to 'https://druttle.ru/wb?keyword=kambikuttan.%20net%20novels%20pdf'. This indicates the document's primary purpose is to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/wb?keyword=kambikuttan.%20net%20novels%20pdf
    • https://static.s123-cdn-static.com/uploads/4409421/normal_5fe568c7a9679.pdf
    • https://cdn.sqhk.co/lufezeralon/ggjiicM/movalaxu.pdf
    • https://cdn.sqhk.co/vimewiki/aK8gchc/49896814300.pdf
    • https://cdn.sqhk.co/xezufulozuwo/dKCCif1/konotemex.pdf
    • https://cdn-cms.f-static.net/uploads/4485004/normal_5fd7737d7fb49.pdf
    • https://cdn.sqhk.co/padasagam/hggjmij/night_agent_i_m_the_savior_mod_apk.pdf
    • https://cdn.sqhk.co/bapisolel/ijjejfq/nixisalewusiweves.pdf
    • https://static.s123-cdn-static.com/uploads/4403428/normal_6005f3cc54b00.pdf
    • https://static.s123-cdn-static.com/uploads/4465388/normal_5ffa89f4ec010.pdf
    • https://kobalogowitat.weebly.com/uploads/1/3/0/7/130776452/35aa311.pdf
    • https://static.s123-cdn-static.com/uploads/4444875/normal_5ff1f3ae8cae6.pdf
    • https://cdn.sqhk.co/zafupusapun/ZfX6icf/tobexoriluri.pdf
    • https://cdn.sqhk.co/wufevinek/AgfDrd3/pujixoxubizix.pdf
    • https://cdn.sqhk.co/xesozugis/dgch9gc/vojiwewa.pdf
    • https://cdn-cms.f-static.net/uploads/4392218/normal_601b026b398a5.pdf
    • https://cdn.sqhk.co/fujesepulo/rhdhcif/blood_pressure_machine_omron_m3.pdf
    • https://static.s123-cdn-static.com/uploads/4463306/normal_5fdd09b63fb91.pdf
    • https://cdn.sqhk.co/posojuvapono/1hhyRrH/22613014163.pdf
    • https://static.s123-cdn-static.com/uploads/4413590/normal_5ff190d6e0a4a.pdf
    • https://static.s123-cdn-static.com/uploads/4413473/normal_5ff1fb4888169.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102Hussain
    • http://smc.org.inhttp://smc.org.in
    • http://www.daltonmaag.com/
    • 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
    • https://gitlab.com/smc/meera/blob/master/COPYING

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c489.bin
cac141edd2e8def8221bffbd8b71bcfa3c28d493bca582fa7fceda90afd44f59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC489 5240 bytes
font_01_sfnt_off0000d645.bin
560f1f39dd8c1375bd0afe4555bcf5ad20055d10be244c4fd4c6f94be3737b37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 5344 bytes
font_02_sfnt_off0000e9d5.bin
cdcd68010af407a6fa340a21681744b6b8341dff326bb47e6db5c9c11e9a40ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 14480 bytes
font_03_sfnt_off0001174f.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1174F 4324 bytes

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