Malicious PDF — malware analysis report

Static analysis result for SHA-256 110b3fd00b817930…

MALICIOUS

PDF

81.0 KB Created: 2021-03-17 19:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7fe2c1da5874a8d826e0bcaf6d71c76a SHA-1: 954a4a38c1aee753d47b218d8925804b73ed2cd0 SHA-256: 110b3fd00b8179305ea0ddaabd4b68f971e530e23dc78cb024d3b28f0176f806
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body, though heavily obfuscated, appears to contain metadata related to drawing standards, suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=iso+mechanical+drawing+standards+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_60488aa524e09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_60418b3896c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_604173b3218cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413005/normal_604981fcc870e.pdfIn PDF document text
    • http://marudibiwel.iblogger.org/chain_guide_pit_bike.pdfIn PDF document text
    • https://kusafulidofet.weebly.com/uploads/1/3/4/0/134017607/bubalotazewesakeku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5ff5f84a44406.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413842/normal_5fec8c5b7914e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370073/normal_6005445f4dd86.pdfIn PDF document text
    • https://bovatukal.weebly.com/uploads/1/3/0/7/130739183/fufuginetok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_605233147f2ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416671/normal_602ecf785f1cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455374/normal_60229f247d619.pdfIn PDF document text
    • http://libonox.22web.org/encyclopedia_britannica_color_full_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_22f620752eae4e4b858b8cdd31c57d6e.pdf?index=trueIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_8a674fd867924f46935fb67978431d83.pdf?index=trueIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_4e01b635b3974ed0b928bc91d742ff6f.pdf?index=trueIn PDF document text
    • http://wagibederujejo.rf.gd/jinotowe.pdfIn PDF document text
    • http://riberudedanute.epizy.com/android_x86_pc_system_requirements.pdfIn PDF document text
    • http://jopokodex.rf.gd/choorian_1998_film.pdfIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_aaef4ba253394a0da2d6741fd12d1f82.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 5388 bytes
SHA-256: 3d2abad48c975b698bec69a6e2fac8e7a64c20070b690cbd67fc20bd77ff4e5f
font_01_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 11472 bytes
SHA-256: c5ce29e7900b5ad3a2d7ef70b392722882cae00d603869a9e051bd538cebd90b
font_02_sfnt_off00012861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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