Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fb5999a2bfebf6…

MALICIOUS

PDF

72.8 KB Created: 2020-12-17 02:20:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6113f45fbac44d5127ab50469ebe7c21 SHA-1: 74eac57fa36d164aa04ba377b47e262c94b1e335 SHA-256: 71fb5999a2bfebf6d4143180a0794354470f5d12933d615d06545f4427e15602
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with critical heuristics indicating it's a redirector and part of a link farm. The ML classifier also flagged this PDF as malicious. The embedded URLs likely lead to malicious or spam content, aiming to compromise users through initial phishing or by directing them to exploit-laden sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://traffking.ru/aws?utm_term=answer+tea+plaza+singapura In PDF document text
    • https://sexuxuputipod.weebly.com/uploads/1/3/4/8/134855156/gevib.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/765a600d.pdfIn PDF document text
    • https://saselafe.weebly.com/uploads/1/3/4/8/134894966/kidorovis-medadoximafopix.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/6457746.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/eb8f2d7dc366.pdfIn PDF document text
    • https://sexozorojupur.weebly.com/uploads/1/3/4/3/134390270/3219319.pdfIn PDF document text
    • https://joleziravakejar.weebly.com/uploads/1/3/4/4/134460301/bfe62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd131452f90b7fe52ecb/t/5fc850cd4b97230d0508ff9e/1606963406709/49971176638.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd21f7afe2dd55ed9cc0dd/1606230519990/83035813918.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4d58cab79f442f242bf92/t/5fc782aca3696915e2277a9f/1606910637118/53230634164.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe14d49ee0f32b871bbb93/1606292695681/94410926005.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4d26f8cdb769c6d919da/1606372646658/97692274147.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0b373fdc31513a1196f7/1606224697397/hahn_appliance_outlet_inventory.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf18173299f0c5438ca89/1606218114781/71883909579.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_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 5120 bytes
SHA-256: e40f7ecba8c1be0478b07a662bb78914a8b7561ad98c3c8a39d71757bbdb9f92
font_01_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 11584 bytes
SHA-256: 7a0ccf932628708553c173ca823aedac7776003a180661ecd87ca032480a798c

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