Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee8b0dd59f09e35…

MALICIOUS

PDF

71.0 KB Created: 2020-11-23 08:04:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 73fbc3138d791c88c35f6b08a2d6cc50 SHA-1: 86139bf69cff9257ebf4814855f726711adc25ff SHA-256: aee8b0dd59f09e3536057f08dd292ef813fab83ff7ef794654a2db644cc363f7
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to 'traffine.ru', which is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to job interview questions. The presence of numerous links to S3 buckets, some of which are benign and others unknown, suggests a link farm or content distribution strategy. ClamAV and ML classifiers also indicate maliciousness, specifically classifying it as a phishing trojan.

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://traffine.ru/aws?utm_term=project+manager+position+interview+questions+and+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_5f92553ba1357.pdfIn PDF document text
    • https://kuzasafeg.weebly.com/uploads/1/3/4/5/134586407/pilabokinupu_mutuwabev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410448/normal_5fb578dba6a31.pdfIn PDF document text
    • https://zipibolusoxa.weebly.com/uploads/1/3/4/6/134627603/5031957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_5fabcafa004c9.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/mewezekilafef/6048877836.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/63654221101.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/angel_banishing_symbol.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/boxing_2_live_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/the_language_of_composition_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/sufoselaxil.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/48162021835.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/brother_embroidery_design_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/31904165148.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/acta_constitutiva_de_coca_cola.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_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 5716 bytes
SHA-256: 02a51fcabea24a43704fa24bbab3bf3e28a8d5a25e103cb917ebebc6133135ed
font_01_sfnt_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 10568 bytes
SHA-256: 88b9a09c8847bcc2524e39ae182a7c6ad9afcd4299e465f6132f5798d5662971

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