Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a48356b6d9611c1…

MALICIOUS

PDF

67.1 KB Created: 2020-11-20 00:30:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ce674346f1b6991c79564ec5966a836a SHA-1: 16f33701033fdc89f5c36cc3c4fbec1f581c8fdd SHA-256: 5a48356b6d9611c15fb979ed426169b63a0462ff98fb42dd1a01d4449500faf2
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded URLs, particularly 'https://gettraff.ru/123?utm_term=cloud+sheet+formation', indicate a malicious redirector. The presence of numerous PDF links suggests an attempt to distribute further malicious content or engage in phishing. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=cloud+sheet+formation In PDF document text
    • https://xesapidad.weebly.com/uploads/1/3/4/3/134346602/485506868c546.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/2d627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459780/normal_5faa2253924f8.pdfIn PDF document text
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/larodajojurufup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac360e0-ffdc-4abc-960f-06e5c1f66ccd/39809968638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe216b16-115b-4a67-8e74-6afffe5c5632/ffxv_level_cap_140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f2827a-77b1-4e91-bb01-f792930611b6/38381545550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc57d29d-95eb-40a7-8805-6218bda72ae8/70181363871.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/pusijuferebemefa.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/molecular_polarity_lab_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3b4e97-ce80-4401-8f91-1371cffd43cf/14983033607.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/selemevefafexugus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e701ec-ae4c-4516-a209-6aad4cbbff76/dragonborn_5e_breath_weapon.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_off0000c932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC932 5052 bytes
SHA-256: 98104b4c689b0d2bcdad043067516f6c42370266c033f78c1b6a5d00df224276
font_01_sfnt_off0000da2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 10892 bytes
SHA-256: 2c1aaefb573318ba62ca6b17494100bb707a305ada77147de21fb594a2d627e2

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