Malicious PDF — malware analysis report

Static analysis result for SHA-256 555d248542f6a72b…

MALICIOUS

PDF

72.5 KB Created: 2021-05-31 06:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd08de4c552be7b30982eec0138a6788 SHA-1: c10355641728873a178e0e8d3f19a6779ddbd239 SHA-256: 555d248542f6a72ba877a78065e7927803d2e47cbf11904262ff824ea2d90625
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, indicative of a link farm strategy. 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 external links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wb?keyword=proto%20rail%20paintball%20gun%20parts
    • https://kovegebefubiz.weebly.com/uploads/1/3/4/6/134665714/c5e3380655692.pdf
    • https://gexemuxu.weebly.com/uploads/1/3/5/3/135394015/jaramuzazi-nekelorigavofa.pdf
    • https://weworikifuga.weebly.com/uploads/1/3/4/5/134515792/tegasiragazene-lifev-tawoxawip.pdf
    • https://menajogatidufe.weebly.com/uploads/1/3/0/7/130740573/tamufopale_pewobeta_bukiwadatiniv.pdf
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/ruzibaxigeni-lotedoziwosofez-gekovabunekitid-tesaxabarobege.pdf
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/7558172.pdf
    • https://cdn-cms.f-static.net/uploads/4478961/normal_60561d48a270c.pdf
    • https://cdn-cms.f-static.net/uploads/4498868/normal_6026f25f0de52.pdf
    • https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/jokivifinaseruruba.pdf
    • https://maxazokal.weebly.com/uploads/1/3/1/6/131606281/fce66ae3.pdf
    • https://cdn-cms.f-static.net/uploads/4469353/normal_600f2f3a48065.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9444750b-a716-419e-be7c-7b3162d6fc79/medovadi.pdf
    • https://uploads.strikinglycdn.com/files/42a454f0-f351-4edd-89ff-4b344af02bf7/7.3_powerstroke_parts_catalog.pdf
    • https://uploads.strikinglycdn.com/files/ccedd0ab-8ec2-475a-9ed6-16e8351d92ef/89291367602.pdf
    • https://uploads.strikinglycdn.com/files/ba4567f1-06c9-424c-a84c-9d729a407a9b/piggy_lord_of_the_flies_physical_description.pdf
    • https://uploads.strikinglycdn.com/files/a17c319a-de0d-48a1-a728-7a834378e555/shostakovich_waltz_no_2_score.pdf
    • https://uploads.strikinglycdn.com/files/b80a23c7-bfdb-4308-ac08-0981e838af67/11436206221.pdf
    • https://uploads.strikinglycdn.com/files/914c597a-4f6a-46f0-b8d2-f3ef0edc375e/how_to_fly_a_drone_for_beginners_uk.pdf
    • https://uploads.strikinglycdn.com/files/1e407023-18dc-4091-b8bc-b137c8ef5246/muxupow.pdf
    • https://uploads.strikinglycdn.com/files/b8d3b165-2a94-4a78-bd46-681946345d9d/zekiwow.pdf
    • https://uploads.strikinglycdn.com/files/d7a7ff80-4eb1-4055-a849-ecfd0324ef9d/fajimuzuvoburaxaredafusi.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_off0000dc8d.bin
fd365a5dc0bc45db27d5d5bfac9ce19d01660c345dc85dcbf61eb3d4788479dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 5128 bytes
font_01_sfnt_off0000ee07.bin
13b97289f66ac3f6977036e93b9ae99018568ea843d37681a1218f7061fbae83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 11416 bytes

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