Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a0bb5ef9487938…

MALICIOUS

PDF

76.7 KB Created: 2021-03-27 11:34:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 87e2333508afa0470afc50b4b36bfbf0 SHA-1: 74d14e29201289c228db77f17d131322fa0cb97e SHA-256: b6a0bb5ef9487938442f53fc23c6be447f7e5285b35dc89d5fe332c93ed4324f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of embedded URLs and the overall structure point towards an attempt to exploit users through deceptive links, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/123?utm_term=root+firewall+apkpure PDF link annotation
    • http://joxorapux.22web.org/medonadavaxogowafi.pdfIn PDF document text
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/minef_dapubasu_rezapisipobe_tupigaxunozar.pdfIn PDF document text
    • https://naxomusiji.weebly.com/uploads/1/3/1/6/131606859/kulizelugu-togot-sawiped-nubak.pdfIn PDF document text
    • https://jivetekerujurar.weebly.com/uploads/1/3/2/6/132695216/xavevoguvizener-kupiwelivekivez-fitojurum-wetinomefu.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/848962.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/podewizupelumu-zamolaz-fametedelete-neratusedulul.pdfIn PDF document text
    • https://wumezovavupod.weebly.com/uploads/1/3/4/7/134741594/7983064.pdfIn PDF document text
    • https://firunonosud.weebly.com/uploads/1/3/6/0/136052948/pimopovevujaduw.pdfIn PDF document text
    • http://nizulekun.iblogger.org/kifiwetejepoxesizajot.pdfIn PDF document text
    • https://pobivizitonep.weebly.com/uploads/1/3/2/8/132815986/7378891.pdfIn PDF document text
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/valodi.pdfIn PDF document text
    • https://bemiredo.weebly.com/uploads/1/3/5/3/135322707/9d5d3aab6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/novifamigot/how_to_fix_ps4_ejecting_discs.pdfIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_9126166809c349028cb40e7f56470390.pdf?index=trueIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_322394e0d0944dc4afdb6bcc8aff460e.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_812785158c6e42868d170127a58fe2d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/xozumi.pdfIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_a2846511d4944180840882258448ed32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mipeboro/floating_solar_power_plant_seminar_report.pdfIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_a4cf62c6d66c43419c2fa86f6a4e00bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dozore/88257251095.pdfIn PDF document text
    • http://xezeruv.epizy.com/zenifejagilonegejeda.pdfIn PDF document text
    • http://zoguberuwanu.rf.gd/miworenugapizaxubuw.pdfIn 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_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 4880 bytes
SHA-256: 86872be510a0124f4f0a23692f794423c9431af21fa621e1b091c26a0842827b
font_01_sfnt_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 11084 bytes
SHA-256: b6f47faad3c24c79daf6cf2efa2aec650806679a59456a9f139c0a80e9928f4c
font_02_sfnt_off00011069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11069 16132 bytes
SHA-256: ca0bb856d51d4c440eb4e48db524e4b4a87bf80294704eab3ae97752e74326e1

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