Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec64a0ea9399740…

MALICIOUS

PDF

68.6 KB Created: 2020-11-26 06:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1efd066c6c2f69c2cde1dcf6252d8c5 SHA-1: 1c9827e1648dacb00c5850a1e4e94feb4bccd234 SHA-256: dec64a0ea9399740bfa0581934d12db05c3a821940553515243437d8bace87b4
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam campaigns. No scripts were extracted, but the embedded links are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gettraff.ru/strik?utm_term=smile+poetry+in+hindi
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/2dc77dc4f33d7.pdf
    • https://manonerotorupu.weebly.com/uploads/1/3/4/6/134683358/jutepusax.pdf
    • https://xosuloduviz.weebly.com/uploads/1/3/4/8/134890731/9994392.pdf
    • https://juzowugaf.weebly.com/uploads/1/3/4/7/134773334/xabolewa.pdf
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/fewani_nevopoluzej.pdf
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/7494562.pdf
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/9562dde99d.pdf
    • https://sipelebe.weebly.com/uploads/1/3/4/3/134312525/4704478.pdf
    • https://ruxapumuful.weebly.com/uploads/1/3/4/6/134682584/lefexewurub.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/godekux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bojafazes/prime_factorization_of_2016.pdf
    • https://s3.amazonaws.com/sukedil/57217541588.pdf
    • https://uploads.strikinglycdn.com/files/d8ff1f04-b4c6-4e25-be93-559f010b78fe/viwuzegavumazumarunoji.pdf
    • https://uploads.strikinglycdn.com/files/74449c5c-3edd-4442-8856-b8867f53d299/rijulipefop.pdf
    • https://s3.amazonaws.com/lakadutof/types_of_editorial_writing.pdf
    • https://s3.amazonaws.com/kevava/amd_a4-_5000_apu_driver.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc3d.bin
bdec178c676094d7f76c8d8b664b03ebd873f15dd84ebc3b4af6b10980d7f376		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3D 4804 bytes
font_01_sfnt_off0000cc51.bin
6edd2dc65f8cc0d4bfc465674af3a6957927c9580e196fa1f2ecab0bfce717d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC51 2024 bytes
font_02_sfnt_off0000d5e7.bin
645faf79ef201b927ad7ff5000d212a11b57caa205486ef926abb687747c0006		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E7 9768 bytes
font_03_sfnt_off0000f73e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 4324 bytes

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