Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0c6e61e2f111b9…

MALICIOUS

PDF

74.6 KB Created: 2021-01-30 22:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 842a2bee04a3eb7d3095a24c474c9142 SHA-1: 2760d4b4f75f3cb2c842f5b4b26b593dbaa40216 SHA-256: 1a0c6e61e2f111b9cec3a8756890c81affe16cb3737986a9c7ed33674484e3ce
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/wb?keyword=new%20year%20photo%20frame%202020 PDF link annotation
    • https://lekikibobasiva.weebly.com/uploads/1/3/5/3/135350768/jezeselobazefap.pdfIn PDF document text
    • http://delayikapy.xyz/991133459607v84u.pdfIn PDF document text
    • https://nunodovov.weebly.com/uploads/1/3/1/3/131380210/3c42b4a.pdfIn PDF document text
    • http://kisiguvawatabom.22web.org/61875169459.pdfIn PDF document text
    • http://amst-watch-v1.club/tovomudemxdk0u.pdfIn PDF document text
    • http://pezozolagipiv.22web.org/4346402502.pdfIn PDF document text
    • http://mebelrostov.ru/acuerdo_marco_codelco_2019nshsa.pdfIn PDF document text
    • http://2220202.ru/dopokezegepukapiretreko5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/cleaner_app_for_instagram_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/padman_movie_kaise_kare.pdfIn PDF document text
    • http://disiroto.epizy.com/xaxoxukanuberidodo.pdfIn PDF document text
    • http://noxikemudenuma.epizy.com/colloquial_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/azitromicina_suspenso_bula.pdfIn PDF document text
    • http://pimuxexud.epizy.com/vunuxizifezin.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/46460476540.pdfIn PDF document text
    • http://pexaniruvuwuwe.rf.gd/24893804103.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 5368 bytes
SHA-256: 034dc01696658d2e02e1d3639a88ae291e0599bd1ca1660a9666416979394f5e
font_01_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 11088 bytes
SHA-256: fd77faa51573ad86b1cbc8d3dd41195ac7e49f7832ca13010a70553567c25c33

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