Malicious PDF — malware analysis report

Static analysis result for SHA-256 681b642100063ff5…

MALICIOUS

PDF

81.0 KB Created: 2021-04-18 15:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fc0ec3f0e189bf8b4db8268186a61bdf SHA-1: c5a8c1679c5079eef0237263a22611305e9a918d SHA-256: 681b642100063ff5f0b6bfbb0a910d3181a2e969e9d7e1e9b1f5474738353e97
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 0.9996

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://pelibifir.ru/strik?utm_term=what+is+management+information+systems+%2528mis%2529 PDF link annotation
    • http://helpcopyright-service.com/messages_for_web_samsung_s9w8a77.pdfIn PDF document text
    • https://fifofisepag.weebly.com/uploads/1/3/5/9/135985139/dowofi.pdfIn PDF document text
    • http://secureappeal.com/conjugate_acid_base_pair_worksheet_19-_2wvraj.pdfIn PDF document text
    • http://kraftmann.su/how_to_start_the_last_wish_witcher_3dqvvp.pdfIn PDF document text
    • http://masito.space/545189002661n1b7.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/fegurozugazoro.pdfIn PDF document text
    • http://maykistore.ru/25892686918mva07.pdfIn PDF document text
    • http://8bitbeardsco.com/how_to_setup_stc_1000luzks.pdfIn PDF document text
    • https://teguvazotumeli.weebly.com/uploads/1/3/4/0/134041540/xifefapugexudaja.pdfIn PDF document text
    • http://reetodo.online/xupeferodipenijipuk7z8.pdfIn PDF document text
    • http://fresh-ita.space/76523842864qtyzw.pdfIn PDF document text
    • http://bbflowers.net/78595579338pynxv.pdfIn PDF document text
    • https://buxenawemino.weebly.com/uploads/1/3/4/5/134581697/2503340.pdfIn PDF document text
    • http://vquest.website/tucson_gem_and_mineral_show_2020_hoursr3e58.pdfIn PDF document text
    • http://sosed.market/96273952937wq5vi.pdfIn PDF document text
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/5b12f6f78d5.pdfIn PDF document text
    • http://tranquils.space/video_editing_software_mac_free4dp3c.pdfIn PDF document text
    • http://devlp.design/39873824863kpb3t.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/bidapovedarel5r7dj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_d35fc6fd3add4bd3afee448642f711c3.pdf?index=trueIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_531d7cc1b81d48f3bdd66f29342a7507.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_8328dc94ef7548eab6b20fcb49adbb8e.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_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 5420 bytes
SHA-256: d952928f24ea2e584831619329e2d896f5e091416c66e6080d0123756fd3425d
font_01_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 10080 bytes
SHA-256: 2e979f86ad20105cc920b4d756d6c480a86671f443249c2c7aa788bcaf111afe

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