Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbe19573f81c796…

MALICIOUS

PDF

89.2 KB Created: 2021-03-22 21:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 76053d65d7b8cad333808ac5cc0a68bc SHA-1: c56ce3cfbba56af95632f6f577a9e57bd784f18f SHA-256: 9dbe19573f81c7965147d93aab40864e6dfd7a3a2cae3ab24a1b0f7972d7b43f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with several heuristics indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or malware distribution. While no scripts were extracted, the presence of embedded URLs and the link farm behavior point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://xajibur.ru/123?utm_term=l2+revolution+skill+guide PDF link annotation
    • http://pozijuza.scienceontheweb.net/bazibonezewusufo.pdfIn PDF document text
    • http://kufomabid.mywebcommunity.org/81867815516.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/jagux/mebojupawizejenuvuzob.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/10731754675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c63b0b81-d74b-4455-9ea6-3bafd7c1460f/42500584113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/113a8226-e37c-4ecb-aa44-ad4618b75893/what_is_the_purpose_of_project_quality_management_quizlet.pdfIn PDF document text
    • http://pepajefosub.epizy.com/avery_labels_design_pro.pdfIn PDF document text
    • http://farilofisimoru.rf.gd/regivupadatixodizosi.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/96732779453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f884618-8d15-4b3b-8252-789a7b278f1e/genie_blue_max_learn_button_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8960df91-a978-45e0-b369-4b77967d1548/how_to_landscape_a_home.pdfIn PDF document text
    • http://novogizeboje.myartsonline.com/mipowoboxilatokono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fadf45ed-cfad-4f2a-b52d-23cd3cacc1c9/how_to_switch_off_ipod_nano_6th_generation.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/beats_studio_3_skyline_collection_wireless_headphones_-_desert_sand.pdfIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_656791ff34ee498b84ec16cab78eae29.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/17480666471.pdfIn PDF document text
    • http://totuxivez.onlinewebshop.net/bipolar_disorder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d5626ea-df1e-4130-ab6a-ea4dae44acaa/zulotaxatinaxubogebokofuw.pdfIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_a63a4cb1927741b78bb5b8d8d9e4543e.pdf?index=trueIn 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_off0001213d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 4980 bytes
SHA-256: d3b7d261b98d16d508d133145dd5fd272ca358ef6248ec3b12d93988ff47161d
font_01_sfnt_off0001324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324E 10476 bytes
SHA-256: fbeca84c9541b52f3822ab9c2aa85487d83eaca4a6dd18f2cb48b7aca98c5da5

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