Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0b65187488b34c…

MALICIOUS

PDF

84.9 KB Created: 2021-03-14 17:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ae23d0bc0b1a520131f39528bb116185 SHA-1: 5abc0e14bf74aed8926961a807ead7654ba04021 SHA-256: dd0b65187488b34c5a57c832786ec4ee1dd2c9fe8ae4ed2bf801fecaac5ad21d
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://golowaki.ru/award?keyword=basic+academic+writing+skills+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377407/normal_5ff42c8f872d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469365/normal_6035f4bd47972.pdfIn PDF document text
    • http://geramik.22web.org/sun_joe_spx3000_for_sale_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461773/normal_604a31b198988.pdfIn PDF document text
    • http://gagefepinulivaf.iblogger.org/anticonformista_sinonimi_master.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478961/normal_60195d874445f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483610/normal_6022cf8983605.pdfIn PDF document text
    • http://figupatofewox.iblogger.org/irs_exemption_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_7b59fb58a0a9413db3b686f4c2909dac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5814792-342c-469f-8192-2c8cca39e5e6/methods_of_language_teaching_download.pdfIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_1f7a8e9feb77446d93fde92cbeccd00f.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_ab3fc887e2ad4978b20b3a5e2e23379d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53db487-ee36-4d92-abf9-525cf32f4c68/reasons_why_america_is_not_the_greatest_country.pdfIn PDF document text
    • http://jexukavelewin.rf.gd/49162689988.pdfIn PDF document text
    • http://gukerarewaf.epizy.com/77895087818.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_c3b82c605a8d42a59963b5aecea6804b.pdf?index=trueIn PDF document text
    • http://bovofekigigewij.rf.gd/becoming_a_person_of_influence.pdfIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_57338ee227654d6580d421d4f0b7cf86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75c79251-7b06-42da-8785-01d637a8803a/nikon_coolpix_l330_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054c2748-fc1e-4c13-859a-cffe966bd437/15567608444.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_bd20e74b3bad4f98bc4bc49ff48c26e4.pdf?index=trueIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_3045fc33cbe14bbc8dd50b5ce6445185.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_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 5680 bytes
SHA-256: 750b83f89029fdd0bcc4e3647fa3bdee6378d0928253dc8dad7cbc0a3c8268d3
font_01_sfnt_off00012053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12053 11120 bytes
SHA-256: b89503e3718916edb4cdf67f53c6c5626fb1b15562e8b2197dc2eeb5e039726d