Malicious PDF — malware analysis report

Static analysis result for SHA-256 af37eef81ec7819f…

MALICIOUS

PDF

74.1 KB Created: 2021-01-09 22:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ccdac252ed2c51e4368ab9efd6f1b267 SHA-1: 9018e5dc81bc2e1af4b615f69e5c8b18d08ba8be SHA-256: af37eef81ec7819f6ce6508e52ace8640eada18ed8a0371100c456feed434564
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm designed to distribute malware or lead users to malicious sites. The presence of a PDF_SEO_LINK_FARM heuristic firing strongly indicates this malicious intent. The document body, though heavily obfuscated, contains references to 'Adobe reader windows 10 offline installer', likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://traffnew.ru/aws?utm_term=adobe+reader++windows+10+offline+installer PDF link annotation
    • https://kawififelotus.weebly.com/uploads/1/3/1/4/131437833/4074549.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/826363.pdfIn PDF document text
    • https://domenotupeloli.weebly.com/uploads/1/3/4/6/134685365/nuzikenukajegidi.pdfIn PDF document text
    • https://site-1172709.mozfiles.com/files/1172709/simply_tuner_violin_cello_violation.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/tanumasofogivam_mogezopekes_xawuxoxo_rigopiduronija.pdfIn PDF document text
    • https://wudonazig.weebly.com/uploads/1/3/4/6/134675044/479a33c1.pdfIn PDF document text
    • https://site-1167986.mozfiles.com/files/1167986/amazing_facts_about_international_space_station.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/lejivugeleguwod/junugaxuwejofigofoze.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/fowosimuwijavuloso.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/bubble_shooter_5_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/best_reader_ios_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/2000_hyundai_accent_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/banjara_song_free_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/lineage_tree_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/jovaxobokal.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/pobekes.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFF 5316 bytes
SHA-256: cd0aee125f226ce438bd329b1a10f0d2ee349482d2cc49f8e8536729b2eb3afe
font_01_sfnt_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 12120 bytes
SHA-256: 5f66b0a2f552bf00daa36a2380edf14d6b978b5526de0f5d36a92b1d4d762d38
font_02_sfnt_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d

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