Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a5ca93366b63c4…

MALICIOUS

PDF

45.7 KB Created: 2020-11-07 04:23:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4041a25d3b1ce690f3c7e96b92d59380 SHA-1: aebe50e7fa3c410f25d5ffb790b3364d85611658 SHA-256: 51a5ca93366b63c48da53946eee086840895793579ac4d02ddb0eb3d084db40e
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 of which are hosted on strikinglycdn.com and appear to be part of a link farm. One of the embedded URLs, https://traffnew.ru/123?keyword=nanobacteria+case+study+answer+key, is flagged as suspicious and likely leads to a malicious resource. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/123?keyword=nanobacteria+case+study+answer+key PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/23f4a543-ca7a-4332-9bc5-1e480f32f901/xalawumepuxofuki.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/vilakidamivuwituv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0417c337-411e-4225-8c0d-eb85c015975e/all_the_vedas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b08daf-692f-465e-90b1-dc6940e4e07e/3rd_master_hard_disk_error_press_f2_to_resume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b4a35a-83f4-4730-85f0-8d14d5be97ac/53091419969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc8ada7-1d05-4a69-a91c-9077a6a33eb9/toshiba_vhs_dvd_recorder_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/176e45dc-75d3-4dfe-b6eb-dc853e0c8c27/packet_capture_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1463b1a0-ec5a-4750-af62-2c2a65e9cf6c/how_to_make_glass_in_minecraft_xbox_360.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/96958944729.pdfIn PDF document text
    • https://wefaresif.files.wordpress.com/2020/11/34639903412.pdfIn PDF document text
    • https://danuxowifoka.files.wordpress.com/2020/11/81049847910.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_off00005f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F14 5268 bytes
SHA-256: 5e10663d18cace23c155f7aac27954935c37c84a8f445f294eeb4ae8f16c21ca
font_01_sfnt_off00007126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7126 10376 bytes
SHA-256: d4dbabd14f21766b92ef6b99d010f44d58ddf19ae4c422dc053acebd4e0fa92b
font_02_sfnt_off000094c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94C7 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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