Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dddd0e200b8031…

MALICIOUS

PDF

91.4 KB Created: 2021-03-29 05:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dc63cb4bc732f59d1b705d5297583152 SHA-1: 86fd564502821f0597da68d51915274800f50bce SHA-256: b9dddd0e200b8031dd112abe80a0408134cf346f76c52171d7bfec38fcab1ccb
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=identifying+adverb+phrases+worksheets PDF link annotation
    • http://itawegan.fun/jizexitalqf6od.pdfIn PDF document text
    • http://a-trvl.ru/jipuzikawezutufelup7w67n.pdfIn PDF document text
    • https://cdn.sqhk.co/rimudatige/gghglL1/xuwilifetusenupojusa.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/ehgrjj1/74505945506.pdfIn PDF document text
    • http://beautysss.site/how_to_use_cuisinart_single_serve_coffee_makerlynay.pdfIn PDF document text
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/4095537.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/how_to_connect_dish_to_apple_tv2rq4r.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/chjhijd/first_grade_mathematics_teks.pdfIn PDF document text
    • http://kompledom.com/california_common_core_standards_second_grade_social_studiesea2ya.pdfIn PDF document text
    • https://mijevofere.weebly.com/uploads/1/3/1/6/131606011/8845853.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/aKbjijs/xitumewison.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/12d32c14-6943-4a26-998d-18e7e74b1e61/how_to_replace_a_ceiling_fan_with_a_downrod.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_78677d72671f48ed8f16cb0895645a2e.pdf?index=trueIn PDF document text
    • https://383fd46b-cc41-47b7-9379-19c19d7bb1fe.filesusr.com/ugd/81c43a_a17974871f4b4f54ac4a0579111dc4ca.pdf?index=trueIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_7cfe5bd0fd81489ba446db4ee7868e26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df8ea62e-35df-47f7-a4ce-30a9310e796b/93227926467.pdfIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_bed9dadab8c84efd8d95be736cda5fe4.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_4240d1c076c6483ca32a6e64727285d1.pdf?index=trueIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_2b1bd6793a7c4367a06e0579b9a9df84.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_0dcb058566a24ea38c848575acd120d4.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 5664 bytes
SHA-256: eb0ecb39f8a1057e8afaf81a61d6705e72ca014a1b161e4b3cf8f93d7b57dff1
font_01_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 11192 bytes
SHA-256: 88f1950141f1b1c00502243dbba81c857ad93df1f3c30f6aa8cb020a2d6793ea
font_02_sfnt_off00014a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5E 16164 bytes
SHA-256: 20fb118fb5ac7412b335769623d5d16882a6dc71fe45ee7299baed937008052d