Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f34617994de51e7…

MALICIOUS

PDF

87.8 KB Created: 2021-06-09 06:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 96d118367cf5b56df9191fd4dcf72cd3 SHA-1: 69dc0d28ef65b3ade148010c5d7f9edbbd7c8a65 SHA-256: 8f34617994de51e7a1d29eb5153a338d0e27d4e8c39674cf8d10b42cfc541172
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point to the use of embedded URLs to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=diagnostico+comunitario+concepto+pdf PDF link annotation
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/jizewutu.pdfIn PDF document text
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/zumatafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_60675723bccf0.pdfIn PDF document text
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/janibiwalaro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381102/normal_5ffec2ab8474e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420014/normal_6049143d3e846.pdfIn PDF document text
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/derozosibazivu-salerisidowofok-mugit.pdfIn PDF document text
    • https://tizezesi.weebly.com/uploads/1/3/4/0/134041120/4527947.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529024/normal_5fe0fb0768109.pdfIn PDF document text
    • https://dikabapor.weebly.com/uploads/1/3/4/6/134620412/9606058.pdfIn PDF document text
    • https://gevaboru.weebly.com/uploads/1/3/4/6/134685165/3401455.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/96812110-dc8b-472e-903a-5a2fc3e60667/wefesufosilizaxukuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee15f599-2d7e-4e72-91de-c65a8b7612e8/35041243907.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144423555/74487151594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc7b283-81ac-4a0c-aa0e-0061b4c38b4d/2015_jeep_wrangler_willys_owners_manual.pdfIn PDF document text
    • http://jetipufagi.pbworks.com/w/file/fetch/144675996/how_to_get_mods_on_minecraft_ps4_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7bb3d9d-938b-4f0c-8f17-9ac462303d1b/norman_nise_control_systems_engineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f05c03d8-19f0-428b-b839-a1a43dd99f9d/judul_skripsi_pendidikan_agama_islam_kualitatif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/934c93f7-4cd1-4808-bd8c-1af3c456a578/xizufexirazunejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04bcc817-a8b4-42da-83bf-9940743a07c9/93493000358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c069a079-d516-4780-858d-7d38ca4b28bf/big_green_egg_ceramic_turkey_roaster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7fb446a-bac8-4ad5-b9ce-fa2c49162ce3/ncees_record_references.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/bissell_proheat_2x_lift_off_parts.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/mixemonigir.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_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 5440 bytes
SHA-256: fb5c67ef645a693aa177e9988e3f2ed20c7183b2904da1b8e0646cb116f3b2ab
font_01_sfnt_off000111c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C1 12376 bytes
SHA-256: 2353cf3cbaa2b3dcc52ec79ffe403623ef2121c7debbd5576194d4ff69c51bd2
font_02_sfnt_off00013a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3D 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15