Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f97acd1820e61f…

MALICIOUS

PDF

77.8 KB Created: 2021-05-21 16:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e6f1429c8e980b62f9c8a183dbd66722 SHA-1: 3aba6b0de245cfab96bbd4862afbb28908cca8a5 SHA-256: 21f97acd1820e61fd0b319cab8354a74fcda448224e6704259aeb9725bfb0efb
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on Weebly and S3. The primary external URI, https://golowaki.ru/strik, suggests a potential phishing or scam attempt disguised as a guide for pairing earbuds. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://golowaki.ru/strik?utm_term=how+to+pair+soundcore+liberty+air+earbuds PDF link annotation
    • https://pimetukuke.weebly.com/uploads/1/3/4/0/134017259/gabimum_sivoj.pdfIn PDF document text
    • https://pupalizote.weebly.com/uploads/1/3/4/7/134716330/likazusezowu.pdfIn PDF document text
    • https://miniroworopan.weebly.com/uploads/1/3/4/4/134444940/bopedosus.pdfIn PDF document text
    • https://savozajit.weebly.com/uploads/1/3/5/3/135320594/c85107c64d6.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/mobegogo_xatoxo_kivufe.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/d8f09636.pdfIn PDF document text
    • https://pazomanu.weebly.com/uploads/1/3/1/0/131069777/jifuparixa_bunejaruneret_fajomogura.pdfIn PDF document text
    • https://xadigepuve.weebly.com/uploads/1/3/1/4/131454317/67c198b4.pdfIn PDF document text
    • https://jewinovezuxumat.weebly.com/uploads/1/3/1/4/131407424/9243009.pdfIn PDF document text
    • https://nixifekenebuj.weebly.com/uploads/1/3/0/7/130775280/3618802.pdfIn PDF document text
    • https://pixasowurixes.weebly.com/uploads/1/3/4/9/134904492/demizanunazo.pdfIn PDF document text
    • https://xodomifosipux.weebly.com/uploads/1/3/4/8/134865855/vixufufed.pdfIn PDF document text
    • https://legopojuze.weebly.com/uploads/1/3/4/3/134369078/sugopozugisodofu.pdfIn PDF document text
    • https://miwugurelogubu.weebly.com/uploads/1/3/4/0/134000151/9522760.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/sorapobuk/free_resume_templates_for_word_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/doxamufuwokexaze.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/zapivumimun.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/bravely_default_guide_nintendo.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/41006752412.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/2496934406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe40a92-e7b7-4c6c-a742-1aafe375e20d/19083031782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b82d5934-ac23-49a7-8739-eeb8278de529/49569703294.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/bofozamonifilos.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/samsung_nx300_price_in_uae.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_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 5364 bytes
SHA-256: d0d06826e2753aa30f31044f7e6198367da71b36cfb8b6dd5c23b83777bd5da3
font_01_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 11280 bytes
SHA-256: 077200309df290f93fdcc7cf11a1755fec50e9ceb61cc337d654b6ac4d58146c

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