Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a73fd883613171…

MALICIOUS

PDF

89.3 KB Created: 2021-03-10 22:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 28fa90686a17b6b2fc35319326d21274 SHA-1: 97017f9268ecc80f0a6df55ba06842f6ba7ff942 SHA-256: 71a73fd883613171f50a1fdfe0cf04b65c516c8afd734969b78efcc528dbb682
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/wix?keyword=speight+middle+school+basketball+schedule PDF link annotation
    • https://juxufosuzuvol.weebly.com/uploads/1/3/1/4/131437906/1971854.pdfIn PDF document text
    • https://xovarexo.weebly.com/uploads/1/3/4/8/134895284/pimika-subed-detaxe.pdfIn PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/2521344.pdfIn PDF document text
    • http://nazhivy.net/14237464001fr6s6.pdfIn PDF document text
    • https://luwimaxilonava.weebly.com/uploads/1/3/4/7/134772317/2613350.pdfIn PDF document text
    • http://sarhello.online/html_javascript_template_engine8rx80.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/68308198490.pdfIn PDF document text
    • http://autokenn.com/851884914326anmy.pdfIn PDF document text
    • http://poposiruta.mywebcommunity.org/vifajexiwelopike.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/how_to_make_a_wordpress_website_with_elementor_2020.pdfIn PDF document text
    • https://radufogerexe.weebly.com/uploads/1/3/4/2/134265868/fuwofe.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/nazipewesajegodeb.pdfIn PDF document text
    • https://womazineput.weebly.com/uploads/1/3/4/8/134895737/b7b9ade89.pdfIn PDF document text
    • http://physcoo.com/362127058p04iu.pdfIn PDF document text
    • http://vereffka.xyz/bovokageti7u2cx.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/caf9a746-3a53-4bed-9580-67bee01dcbc6/32251540355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef61c2c-a680-48b9-b2a4-499c4fd5d00a/76949217175.pdfIn PDF document text
    • http://buzanuziti.myartsonline.com/mepive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc39152-4e58-4de9-8845-2a6df8994feb/60835226861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44807e5d-d88e-4604-897a-c7635ae75b0d/how_to_get_band_9_in_ielts_writing_academic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10454bd1-7b06-4fd9-9472-82ed72f3cb0b/epson_wf-2540_ink_cartridges.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/29436430366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf6998c-31ab-44d5-8bea-649ff6e9d92c/vusageweseno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e18571c-9c00-44f4-a257-bc69402b15c7/what_do_numbers_symbolize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e068814d-947d-492a-b5b9-ba971fc743e0/48538371553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b817b6-712d-42c9-ba36-0c26080b8f3d/what_is_3d_echocardiography.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_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 5696 bytes
SHA-256: 7497649ac85d5739fcacf86121a3b70053a813a1a0a7bdc705c425f493b5ce3e
font_01_sfnt_off0001334d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334D 10456 bytes
SHA-256: e547fa36a702e061863dd3d17f6f8b6a506da2edd768a2afb19290608169b69e

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