Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fef6377dc00d89…

MALICIOUS

PDF

82.0 KB Created: 2021-03-09 00:36:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fabc215fbe645293d328ef949e460fdd SHA-1: dbbdbcc9554e97ff5dc1a633d00b175e94bcd549 SHA-256: 49fef6377dc00d891628ba878cd17651035eece397c0612708668ea39b3271d6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to 'Psicologia abordagens atuais pdf' and metadata indicating it was generated by wkhtmltopdf, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/award?keyword=psicologia+abordagens+atuais+pdf PDF link annotation
    • https://mavabebuvaxar.weebly.com/uploads/1/3/0/8/130814237/jalabegamika.pdfIn PDF document text
    • https://vuzufakafedovi.weebly.com/uploads/1/3/5/3/135347170/2442841.pdfIn PDF document text
    • https://puriruwuz.weebly.com/uploads/1/3/5/3/135395363/f3cf805ac1.pdfIn PDF document text
    • https://kivisibef.weebly.com/uploads/1/3/0/7/130775328/bajujaxujij_gifotede_wolokut.pdfIn PDF document text
    • https://besukobar.weebly.com/uploads/1/3/1/0/131069863/8007288.pdfIn PDF document text
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/berowetogide-tororumozafolod-xovafapa-mamupavanog.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/17192.pdfIn PDF document text
    • https://menerixejujup.weebly.com/uploads/1/3/4/6/134605313/simeromaziretapalun.pdfIn PDF document text
    • https://zabivavisona.weebly.com/uploads/1/3/1/4/131452967/28738bbe70948.pdfIn PDF document text
    • https://lefokanu.weebly.com/uploads/1/3/4/3/134377273/jidade-tozitipixiwux-sadotuw-vevudikegov.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/tobovunoberiki/bexugukarezibafinoj.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_5db9a0590af04402ad98d3a25029f19c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e85d85f-1d44-4e01-baf2-276b751cc040/cloud_data_storage_security_issues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ebd651f-1779-4dbb-874f-f04a528a1687/36279246312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c173638-2907-4eeb-bbc1-873859258005/ariel_by_sylvia_plath_critical_analysis.pdfIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_6da8200ffa244cbb9fe1611b629bd7f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58b0761b-dfd9-41ac-9b6f-69f3494fe339/asus_rt_ac66u_b1.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/admission_form_2019_karachi_university.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_a4e8da79a8ce4f7a87815581c78567b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewibim/tv_channel_app_for_android_free.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_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 5464 bytes
SHA-256: c042d2ed0ac9cdd0bd12bd718a3b283ec0e66319bc2c3570591019cbd01155b2
font_01_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 12396 bytes
SHA-256: 86d82fe70ff957411668b753a745cb63b93fba22cdd30f0d46de0a87d4d7c30c