Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b3e059c1e289a5…

MALICIOUS

PDF

89.1 KB Created: 2021-06-09 19:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 631eac93615eb13a74cd5d821261c2be SHA-1: aef3472c8d56bfd54d4537542b6641a621623fe7 SHA-256: d8b3e059c1e289a547c0e110b0df5520a2366d4604781653bdcd6534a35c19f4
184 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to known malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly indicated maliciousness. The document's content, though obfuscated, suggests a lure related to 'family goal setting worksheet', likely a pretext to encourage clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=family+goal+setting+worksheet In PDF document text
    • https://static.s123-cdn-static.com/uploads/4372072/normal_5ff90974b5b29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_604d1e9294401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_603327a6e88b2.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/f0ccd730-35c0-4a72-a14b-1ebc601ea468/where_can_i_get_a_haircut_today_near_me.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/hot_wheels_collectors_guide_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7ed6ae-f76d-48cf-94d9-4fdf573e13cb/nosiwugagojogajotori.pdfIn PDF document text
    • http://zulamiz.pbworks.com/f/93586782306.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/lafavebapomawuvevakatepo.pdfIn PDF document text
    • http://vakerul.pbworks.com/w/file/fetch/144509172/mathe_binomische_formeln_bungen_mit_lsung.pdfIn PDF document text
    • http://rutarotovez.pbworks.com/f/waduw.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/f/somaxato.pdfIn PDF document text
    • http://pebegijopolo.pbworks.com/f/nuliwubomepujanexagegaje.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144411435/human_genetics_concepts_and_applications_12th_edition_by_ricki_lewis.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144453345/what_are_some_abiotic_factors_in_the_rainforest.pdfIn PDF document text
    • http://pebenuziwi.pbworks.com/f/complete_train_conductor_world_full_map.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144612141/download_film_surga_yang_tak_dirindukan_1_lk21.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/what_are_the_vizio_remote_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59dfe81e-2407-497b-9354-7cd1e835b03b/lizizavoxilami.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11573 5312 bytes
SHA-256: bd7d0690d63132e314d9e95c1a7da57e582abe506f7caffcbfa175b160562781
font_01_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00012ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFA 10860 bytes
SHA-256: de0ecb766856e74814cf271812ba09a1d786a3b3762a85710b003a229b343474

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