Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2cb1b2caf25a1d8…

MALICIOUS

PDF

75.0 KB Created: 2021-02-12 08:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c7f1f173d310cbcb04f4c2e0d6174bbb SHA-1: e511dfc0166aaf84e6f5a6b1aea3641c90444140 SHA-256: e2cb1b2caf25a1d8c643d49c01d227bd62be6daadc719f3829a37f95d1309244
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'crophysi.ru'. It also exhibits characteristics of a PDF SEO link farm, embedding numerous external PDF links, with the primary malicious link being the redirector. While no scripts were extracted, the presence of malicious links suggests an attempt to redirect the user to a potentially harmful site for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=adhe%20kangal%20old%20movie%20song In PDF document text
    • https://renokogepebamon.weebly.com/uploads/1/3/2/6/132696434/vawapekoradez_nuxavunuve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379844/normal_5ff622318ff38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_5ff69d6802d23.pdfIn PDF document text
    • http://zarozunaxa.iblogger.org/90220985391.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472484/normal_6009319262a09.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/takateg/odia_song_2018_dj_appu.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/angular_form_control_default_value.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/15989099263.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/lozomumikosonin.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/weves.pdfIn PDF document text
    • http://guxozuzemonixe.epizy.com/jajaverikoxudulilotojunu.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/9879017353.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/minokawikebaruwupaf.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/aifmd_reporting_esma_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/plant_tropisms_color_by_number_answers_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/latifirisaremos.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_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 5256 bytes
SHA-256: b72b9fcd092178cad5950c93fab969e8b6f218bfa660f880b63de8bd1c454258
font_01_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 10828 bytes
SHA-256: a2e3027ea8b92ca4f2799f5127b08b6a95dc33979a2d5ecc5c21e3f4c135dcc8

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