Malicious PDF — malware analysis report

Static analysis result for SHA-256 72016f112f25b9cb…

MALICIOUS

PDF

74.4 KB Created: 2021-03-14 11:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8f9ac071afb0808dc90dbfa278794804 SHA-1: 1cf4aa4e07aafe865618b6ecdba132b9f17642fe SHA-256: 72016f112f25b9cb8413ece2be0f83a089ba8b575ff3ff1ca2b5f21c68f2a272
186 Risk Score

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 0.9997

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://resalured.ru/strik?utm_term=glacier+bay+kitchen+faucet+parts+aerator PDF link annotation
    • http://uscovidcharts.com/mamixavivijamolovenevojdgys6.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/100a79a.pdfIn PDF document text
    • https://lefazevi.weebly.com/uploads/1/3/0/8/130873710/9c137e6e779bd2b.pdfIn PDF document text
    • http://spainsale.pro/88454694068okzjv.pdfIn PDF document text
    • http://wagagawoduzom.iblogger.org/chicken_soup_for_the_teenage_soul.pdfIn PDF document text
    • http://ca-management.website/difference_between_emulsion_and_suspension58smo.pdfIn PDF document text
    • http://kokofiru.22web.org/82808455465.pdfIn PDF document text
    • http://bepajizijuxiz.iblogger.org/cambiar_formato_de_a_word_online_gratis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_425c4faf1e154801b64fe5706672ea06.pdf?index=trueIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_ea3958da52fb417082a30bf80c2ecac8.pdf?index=trueIn PDF document text
    • http://lewimup.epizy.com/vamixuje.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_3dd493068f7d45eba224b359f2c7bc08.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_44173ef1054a4acebf4dae2d137b29b3.pdf?index=trueIn PDF document text
    • https://19eae752-0dc2-40b2-988a-3ead9c543f91.filesusr.com/ugd/dee0a8_dc72cceae6b64653825323aba9dce16c.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_c8d07c4492514217a8a95d266325c6ce.pdf?index=trueIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_6f84bfb1a8db457cbaf9beb99fee5969.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_81815b15c3464452b76442523b8981df.pdf?index=trueIn PDF document text
    • https://cfae799c-d04a-4395-b2c2-700dffd2ed5c.filesusr.com/ugd/15504a_c061ba3d641c4adf8bbe7f892177d061.pdf?index=trueIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_74a6d6cc1f754a08822457d88d3c5ba9.pdf?index=trueIn PDF document text
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_2938e9a718954ba99d98c025e99aedf4.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_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 5440 bytes
SHA-256: 6ef1d540b1aaec03d1f5fc921ca3853f03e3fec88dd82d19b1d11a6879f30e5d
font_01_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 11068 bytes
SHA-256: 5cd5c523771a54d99981e078d33e92d48c3c6b76a2c984c22499fb25921cd126