Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d78723d5d96dfa…

MALICIOUS

PDF

74.9 KB Created: 2021-04-09 13:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc051b8ca43a9b4a8bf7c39733eff279 SHA-1: e2eee98383a0617ca8ce81b340144b65ee342310 SHA-256: 28d78723d5d96dfafc5ecfb0ed45111c9d021cc5c648ee980626b82b34fcf502
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with a significant number pointing to PDF files hosted on various platforms, suggesting a link farm or a distribution mechanism for further payloads. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document is designed to redirect users to malicious sites or download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=black.and+decker+hedge+trimmer+power+lead
    • https://cdn.sqhk.co/petebeki/jajcUjf/38709804957.pdf
    • https://xutobegepoxebax.weebly.com/uploads/1/3/5/3/135333125/ff21ef08.pdf
    • https://buvisipafen.weebly.com/uploads/1/3/4/4/134401595/8372946.pdf
    • https://cdn.sqhk.co/mukujoripu/iqNTbgu/95255309500.pdf
    • https://cdn-cms.f-static.net/uploads/4476140/normal_606a18983374b.pdf
    • https://cdn.sqhk.co/gejijafa/jahgfWr/jbl_cinema_sb150_soundbar_manual.pdf
    • https://tetusujofejami.weebly.com/uploads/1/3/2/6/132695476/kateziniboto_busagep_porim_dodit.pdf
    • https://cdn.sqhk.co/jalinutaxos/mGG2te2/colorectal_cancer_screening_guidelines_2018.pdf
    • https://cdn.sqhk.co/pekotegafod/jjjjngh/air_traffic_control_tower_jobs.pdf
    • https://static.s123-cdn-static.com/uploads/4453332/normal_5feb412c0fd59.pdf
    • https://cdn-cms.f-static.net/uploads/4386366/normal_6067df4132d5a.pdf
    • https://xeruterone.weebly.com/uploads/1/3/2/6/132680908/21bfd7.pdf
    • https://cdn.sqhk.co/sirepajaku/OhbheAY/97461869826.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f5460e28-358d-4bbd-a502-9f5056c8fbfe/baby_g_childrens_watches_uk.pdf
    • https://uploads.strikinglycdn.com/files/b39883be-f735-4ab2-87ef-947720f48f8a/what_is_usyd_known_for.pdf
    • https://s3.amazonaws.com/gixirojozogufux/79216831283.pdf
    • https://s3.amazonaws.com/zabejuvijolu/17631460075.pdf
    • https://uploads.strikinglycdn.com/files/03b3ecd2-8cf6-4a7a-b4dc-33a025e443a6/machine_learning_jobs_salary_in_australia.pdf
    • https://s3.amazonaws.com/tidigudetefumof/kingkiller_chronicles_wikipedia.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e521.bin
6354f8f663486f74ecb79f172ba888326fe4738d058fe83c21f4d0c59b656182		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 5548 bytes
font_01_sfnt_off0000f7ec.bin
a5b4b66e47d7cc490bbdbcfa441307ec6016d17dac92888d87e76c3408f29794		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 11384 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.