Malicious PDF — malware analysis report

Static analysis result for SHA-256 380efec4a5b85ce4…

MALICIOUS

PDF

72.5 KB Created: 2021-02-23 04:33:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3deb743d5876bd3f8881b58be5b6e626 SHA-1: 3094a112ccec3afde537c60739dab80231d82027 SHA-256: 380efec4a5b85ce4c6d3bfa7df83e29e358f5fceaa542b6c7b67dc2a2e9161e2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to 28 external PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious sites.

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
  • 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://druttle.ru/strik?utm_term=a+streetcar+named+desire+quotes+scene+1 PDF link annotation
    • http://hr-insider.com/51365888679ij319.pdfIn PDF document text
    • https://nupepapuk.weebly.com/uploads/1/3/1/4/131484133/81582.pdfIn PDF document text
    • https://siwuxamafovad.weebly.com/uploads/1/3/4/4/134489720/xadap-sozelomajapo.pdfIn PDF document text
    • http://kulokozataxat.22web.org/android_become_human_pc_release.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pipaneku/bofozivavatepotafesetan.pdfIn PDF document text
    • http://fipamopiwip.epizy.com/42479707889.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/61641253865.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/punjabi_movies_list.pdfIn PDF document text
    • http://gunuguduwurenog.epizy.com/fosuxuse.pdfIn PDF document text
    • http://tejojode.rf.gd/adobe_acrobat_standard_dc_12.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/can_t_video_from_google_drive_iphone.pdfIn PDF document text
    • http://wazinupizut.epizy.com/free_andy_os_offline_installer.pdfIn PDF document text
    • http://zasuzutan.rf.gd/ieee_template_document.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/13530465654.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 5100 bytes
SHA-256: 628dc728d824ec2687c1e798a23f62249c24e518de80aee0f8e57c6ec3abb37c
font_01_sfnt_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 10380 bytes
SHA-256: de67b190e4b23808981a682d9ef7afd12bb0d496be50ff67b4f0eab8c7fd00a1
font_02_sfnt_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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