Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70d80b8d3801a88…

MALICIOUS

PDF

75.0 KB Created: 2021-05-26 07:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6be48bd84d71be7740e7837b099c4ae8 SHA-1: dc10db6bd5675617159d078a0210ffd0a0a3d97f SHA-256: b70d80b8d3801a88f0219d3a7c593b7e066dd84ba0167aea6bb471687ac4d227
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The primary URL, https://pelibifir.ru/strik, is likely used to redirect users to malicious content or further phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=cctv+camera+types+pdf
    • https://cdn-cms.f-static.net/uploads/4485435/normal_60269317833a9.pdf
    • https://xiletepegokif.weebly.com/uploads/1/3/4/3/134319576/guwuxanep.pdf
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/201f0c769adb81.pdf
    • https://vatawasuri.weebly.com/uploads/1/3/3/9/133997312/7cca0d9.pdf
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/e78bf125fd4666.pdf
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/9993fbd4387a23.pdf
    • https://vakexojukesazi.weebly.com/uploads/1/3/0/9/130969985/8bc8b3eed8.pdf
    • https://tufanemoxidubux.weebly.com/uploads/1/3/4/3/134315727/fivirumobusosi_xojazelotite_zifofa.pdf
    • https://waripeseditalas.weebly.com/uploads/1/3/4/0/134012866/e082df9bafc6f7e.pdf
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/515820.pdf
    • https://bunojero.weebly.com/uploads/1/3/0/8/130874162/f4d649c56e973.pdf
    • https://static.s123-cdn-static.com/uploads/4462688/normal_60037299480ec.pdf
    • https://kotuposa.weebly.com/uploads/1/3/1/4/131406283/8344062.pdf
    • https://cdn-cms.f-static.net/uploads/4368732/normal_604703bf612a6.pdf
    • https://tonibefep.weebly.com/uploads/1/3/4/5/134585532/gamonokewifige.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cb47e65c-1fbf-45d8-92ba-fd48641d2dd6/sidadazanapelibe.pdf
    • https://uploads.strikinglycdn.com/files/b8f33f7a-10d3-4aaa-9cc1-4c40b9e01b2e/88698766966.pdf
    • https://uploads.strikinglycdn.com/files/46abd87d-9782-4c93-8e61-2986138bc27a/dream_interpretation_red_apples.pdf
    • https://uploads.strikinglycdn.com/files/10ccae14-ebd7-4875-8c50-0ca2b3f9955b/the_summer_is_gone_filmed.pdf
    • https://uploads.strikinglycdn.com/files/b279a6f6-1a8b-40a0-bc39-a2a7b6850ade/zigomanotudirebuxegad.pdf
    • https://uploads.strikinglycdn.com/files/315c8735-ed11-4bd6-a582-351b54717a1c/definicion_del_sistema_endocrino.pdf
    • https://uploads.strikinglycdn.com/files/f9c41631-1068-41b2-8704-25f4c67fe9f5/37017577617.pdf
    • https://uploads.strikinglycdn.com/files/a5304ca2-18e8-457f-bc9d-0ef19e87b5e1/24115533345.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_off0000ea2f.bin
d7b4d952ad6bbd650b471b87e8596210534247cb98cc3ef33c5a92e433202113		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 5336 bytes
font_01_sfnt_off0000fc4f.bin
e208f277767679992db30dc1689c515ab0b82a6785f04a70c12744fd4da12710		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 10040 bytes

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