Malicious PDF — malware analysis report

Static analysis result for SHA-256 3325d254188502d9…

MALICIOUS

PDF

86.9 KB Created: 2021-05-18 14:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 612c9eca41b3a1ae42bb239b19fb73ef SHA-1: d7de4fdf5d4ba12fc689bfde4fdb9205f4effde5 SHA-256: 3325d254188502d9be2d7e4e1705f146c8b0c83404f4949b6e32f4cc1957f6be
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. One of these links, 'https://dugedepap.ru/strik?utm_term=how+much+does+an+annual+inspection+cost+on+a+cessna+172', is flagged as an external URI and is likely the primary malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dugedepap.ru/strik?utm_term=how+much+does+an+annual+inspection+cost+on+a+cessna+172 PDF link annotation
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/kawoxunuroxereba.pdfIn PDF document text
    • https://puvebimu.weebly.com/uploads/1/3/4/3/134311544/3467288.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d00160-e0ea-4ad8-a83b-7c97faef5677/how_to_dispose_of_smoke_detectors_in_new_york.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d30e03e2-dcdd-48e4-b78b-ee7596fa1ee4/49015827204.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/4772353541.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/ccnav6_chapter_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/amazon_kindle_fire_video_format.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/50985848737.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/riello_oil_burner_motor_bearings.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/lawinim.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/96197787367.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/medios_de_comunicacion_viejos_y_actuales.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/group_bharatanatyam_performance_classical_indian_dance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19201b80-5f97-4947-8991-faf81e17c4e1/logitech_k330_keyboard_dongle.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/livery_template_bus_simulator_indonesia_als.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/how_to_develop_android_app_without_coding.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/36021845919.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/lalotorujelekelikebuji.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/xugexelulebasapifemag.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/19365379559.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/72769510971.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/5483830539.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/silitasogeroniwus.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_off00011440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 5536 bytes
SHA-256: 97c41f910fc3b77b37c1b12035ba08de1cc98225ed08f3ea76248762ec3393ec
font_01_sfnt_off00012709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12709 11396 bytes
SHA-256: f722e7a233b0c2c642c1c50aad27346dc968b55a87941a7a4c5f7aba0dd0b099

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