Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc20f3e1fc8e870a…

MALICIOUS

PDF

78.6 KB Created: 2021-04-30 23:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea820a544d840a92330dc716d5aacde4 SHA-1: 1ea7dd06687118af6f3db0bfcda9263ed69dbf42 SHA-256: cc20f3e1fc8e870ad35fcc1d7ecab9b96336345cbbe363e87df3abd6fcb40075
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the primary goal is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://seumenha.ru/strik?utm_term=2017+median+household+income
    • http://jidogirikar.mygamesonline.org/risperidone_davis.pdf
    • http://lazisirogabidir.mypressonline.com/5_practices_for_orchestrating_productive_mathematics_discussions.pdf
    • https://cdn.sqhk.co/xufatirumina/gegirie/30537895722.pdf
    • http://wivaserana.mywebcommunity.org/29434303591.pdf
    • http://luwinilulurop.mywebcommunity.org/how_to_find_initial_velocity_with_acceleration_and_distance.pdf
    • https://cdn.sqhk.co/nanagajog/YjiyheI/worx_18_chainsaw_manual.pdf
    • https://cdn.sqhk.co/posebozej/T2Hhhbi/13597383853.pdf
    • https://cdn.sqhk.co/wabasenenem/hPgecRQ/wokovi.pdf
    • http://daludaja.getenjoyment.net/14340141593.pdf
    • http://matizaw.mywebcommunity.org/44017552364.pdf
    • https://cdn.sqhk.co/sabumijobude/ahpM3id/19877188040.pdf
    • https://cdn.sqhk.co/libobivole/JjaVQhe/83358420740.pdf
    • https://cdn.sqhk.co/zifeduwa/hjdtRhi/moto_g_power_vs_pixel_4a_5g.pdf
    • https://cdn.sqhk.co/jomenuluz/OEifp8q/28803785326.pdf
    • http://bejawutipage.mywebcommunity.org/amygdala_and_hippocampus.pdf
    • https://cdn.sqhk.co/wireriduwude/fgc0jcZ/37739936546.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vuxalirudidel/estructura_del_texto_argumentativo_tesis.pdf
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_386b139beb74440c9a81327bb916ab8d.pdf?index=true
    • https://s3.amazonaws.com/kefefetafij/38324729402.pdf
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_70a42cda4219469ab6e3d1bf5a90591b.pdf?index=true
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_60e5fa99975d4aea897cadbde3b58abd.pdf?index=true
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_53b7f123a820424eb38f8cc83a2df29b.pdf?index=true
    • http://lawaxisagiwog.atwebpages.com/19279490539.pdf
    • https://s3.amazonaws.com/remeranexe/borapovisegekev.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/24847827606.pdf
    • http://zavulelobawabi.onlinewebshop.net/jesowevare.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f9.bin
677e4b38030bb55791f184681a9ae98e70f7a860b947c7f18f27175779bc22ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 5396 bytes
font_01_sfnt_off00010334.bin
885c117a097ecf233ce1a32d7da1637b011cc31c2b1d3b60434958ad3cdab442		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 12840 bytes

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