Malicious PDF — malware analysis report

Static analysis result for SHA-256 b345cf2186ad0dbe…

MALICIOUS

PDF

70.5 KB Created: 2021-03-24 02:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 028f8c802e0ba9e0213ce776ec96346d SHA-1: 5457e1929654f33c676d132efc76069c30467c3e SHA-256: b345cf2186ad0dbe38904e579e9ef300515adcec1d44e640b4299a9f71c6c6b6
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with one prominent URL pointing to a potential application download. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=crackle+apk+for+android+box PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390996/normal_5ffdb9e49e2d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469365/normal_5ffc50a55509c.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/jotejodadopubirux.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/tokarixawabo7au.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/higbqpF/vevemowilekusegutukoli.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/NihaYRw/5458678198.pdfIn PDF document text
    • https://sokimazivad.weebly.com/uploads/1/3/4/6/134620474/eb710e9.pdfIn PDF document text
    • http://energierecrute-emplois.com/9502916252b16tg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389127/normal_5ffd3e3338702.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/suximawo/gogasaves.pdfIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_6976fd64d20b442195f02062a425b7f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vunizi/gagila.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_5843a7a46e8c45269fc6eecc94726154.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/91963655305.pdfIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_8911a816c1924fd485ae3a5e0ae167e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/3d_bike_games_for_pc_free.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_5cc5069d30fa4916befd6fa474564704.pdf?index=trueIn PDF document text
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_e59c50d6d2f94e3886a2dc96b5f73cc8.pdf?index=trueIn 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_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 5148 bytes
SHA-256: 244335cdaf7cc96b34455a1f0528fcbf84587904737be7730ef941b068bebab8
font_01_sfnt_off0000e86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 10712 bytes
SHA-256: 31493e0efb6f4300f5853aec642bb0a9e2e630a5bb366333aaec68b974afa8e8

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