Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf1d8d0949de38e…

MALICIOUS

PDF

76.2 KB Created: 2021-03-07 10:10:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ef68f554c79981476e734b076eae6f90 SHA-1: 05f2446e1005096d739388dcebd81f84fc5c298e SHA-256: dbf1d8d0949de38e6c9c43bfab9e70b51ce24b1ef85bcefb45603726f90052cc
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one pointing to a suspicious domain ('ponafet.ru'). The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a tactic to obscure malicious intent or distribute further payloads. ClamAV detection and ML classification strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/aws?utm_term=binh+ph%25C3%25A1p+t%25C3%25B4n+t%25E1%25BB%25AD+t%25E1%25BA%25ADp+23 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407780/normal_5ff8020ce6d61.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/newejijoresesipijo.pdfIn PDF document text
    • http://sipebep.22web.org/unreal_engine_4_medieval_assets_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450356/normal_5fcc09c4255a2.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/fudofojoxopifeko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_60311a3209dcb.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/befarekogol/tv_guide_denver_antenna.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_7e12ea67b2bb4572a9746ab7a38c7d4c.pdf?index=trueIn PDF document text
    • http://lumosaneja.onlinewebshop.net/91711720274.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/rerufivodikipewo.pdfIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_8a7b180f728c48ad849ace226db2abe8.pdf?index=trueIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_c69713d9324e4f308ae04abffa7452ef.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_d4eb94f253dd48c2818bdd5fc25d24d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/zuguleguger.pdfIn PDF document text
    • http://jozixal.epizy.com/16751763496.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/letulevuji.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/april_showers_proleter.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_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 5564 bytes
SHA-256: 5dc5ded4754b1e598121fbd3d0b3360018e49113356fc8bca1bf1388df4564a0
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 21288 bytes
SHA-256: 808f84fd770dea32b73318743698e00b75434ded9c8171f8b7a3e833565f9cee

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