Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2b2f5f87527487…

MALICIOUS

PDF

77.9 KB Created: 2021-03-13 23:36:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a19b95afbc63c2d14bc156ca2e09050c SHA-1: 29587dc8b7d3d768d48e80b455ff9f4c19683e3f SHA-256: 0f2b2f5f87527487b670f28a4a43d67d9c542e35f10bcb26f2c70ae9a14bd1e7
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO redirectors and link farms, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the document's structure suggest it is designed to lure users into clicking links that lead to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/strik?utm_term=elaboracion+de+mapa+de+riesgos+ppt PDF link annotation
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/8888786.pdfIn PDF document text
    • https://rawabupabazokiz.weebly.com/uploads/1/3/2/6/132695668/1821139.pdfIn PDF document text
    • https://walagewujiw.weebly.com/uploads/1/3/0/9/130968979/439242.pdfIn PDF document text
    • https://riwuwodanujebu.weebly.com/uploads/1/3/4/2/134234990/jopejepotejawuweb.pdfIn PDF document text
    • https://niwejipudid.weebly.com/uploads/1/3/5/3/135383293/2e6ceda2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_5fe795fdd358f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498882/normal_600678fc4a528.pdfIn PDF document text
    • https://jesuzexujugom.weebly.com/uploads/1/3/0/7/130776612/c50d76dd8ef803.pdfIn PDF document text
    • https://nulumekut.weebly.com/uploads/1/3/4/3/134373747/a5ef0b05aaf.pdfIn PDF document text
    • https://geridaradekod.weebly.com/uploads/1/3/1/4/131437552/wowutumogirorizowale.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/xepululejiwof/rinalovekawokikivipetonav.pdfIn PDF document text
    • http://tukurazetuxud.epizy.com/fha_guidelines_student_loans_payment.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/50849703172.pdfIn PDF document text
    • http://refaruzevogot.epizy.com/2020_maserati_quattroporte_s_q4_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/adding_binomials_and_trinomials_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/associative_property_of_addition_grade_2_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/10696903153.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/nubifadukelenosatew.pdfIn PDF document text
    • http://wepaxilex.epizy.com/star_wars_trumpet_sheet_music_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/asus_tinker_board_android_google_play_store.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/57060812497.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/comment_modifier_un_template_html5.pdfIn PDF document text
    • http://wejivitekep.epizy.com/goroxoxumepaxixodup.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/62092953124.pdfIn PDF document text
    • http://zukuvib.rf.gd/collective_nouns_worksheet_5th_grade.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_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 5492 bytes
SHA-256: 71ae9ef8ed3eddedc683a34341afd62efa7093ed8ad2d941a7ad280d1cd7d44d
font_01_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 12032 bytes
SHA-256: 3601b5957e5af10207e77d7cd9a2e1f98318ad2cee60f62490efd53bb8b8a17c