Malicious PDF — malware analysis report

Static analysis result for SHA-256 018e07c13a551a76…

MALICIOUS

PDF

71.4 KB Created: 2021-04-28 17:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aa58bdb51ad52e28eb7ce951d45c3aee SHA-1: 42cc8447aecd2e2b260821376016ee16bc40336e SHA-256: 018e07c13a551a764317a38b82c96a157cfff1062ce5d669226cb2299d018360
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to product fixing, aligning with a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=bosch+dishwasher+integrated+fixing+bracket+fitting+kit In PDF document text
    • http://hurricane1.space/casio_aw-80d-7avdf_manuale6i3z.pdfIn PDF document text
    • http://xuxadozikekop.iblogger.org/printable_softball_scorebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484990/normal_60144844d3c68.pdfIn PDF document text
    • http://avit0.pro/2014_fz09_high_mileageji8b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496616/normal_6036df1cdab43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_605d4aecf2324.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422628/normal_5fc8e6529a519.pdfIn PDF document text
    • http://idealicaitaly.site/vaxijixena49yws.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_c85fa16b4ea04ddaab77c76ca3793ffc.pdf?index=trueIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_fc73751337ee44148ff79b3b99e9f22c.pdf?index=trueIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_d25fd7d93796478e8eccf4e83361451f.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_c265350e05464a42948751b2f569bec9.pdf?index=trueIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_1f889ff4a3f747658a5f722a5089331b.pdf?index=trueIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_fda12bc89a334943b304219fe0072e1e.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_5bfcbd16cb5a4c718d41f97735b901ca.pdf?index=trueIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_95539a8650104b829bcd90e1d6bf2440.pdf?index=trueIn PDF document text
    • http://donenufalu.rf.gd/mefijazobamosegojo.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_098bb874e4c44f999372f12a5f2c774b.pdf?index=trueIn PDF document text
    • http://wevevaviz.epizy.com/autocad_2020_manual.pdfIn PDF document text
    • http://beretufem.rf.gd/bescherelle_anglais_conjugaison.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_d5fcc35b54694cc08774cba5cf68679c.pdf?index=trueIn PDF document text
    • http://janalusexisowa.epizy.com/41448454536.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_ff1158906ee54c66b894d63e526bdda6.pdf?index=trueIn PDF document text
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_9807fbd7693f4e3ead83992c38063ff9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 5664 bytes
SHA-256: 1b520d54b819250e4e472014ee040b3de26ce8dd90d449fad50bb84ff7b95a9d
font_01_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 10300 bytes
SHA-256: d00d183d6c527b50a2850e0fe2839a98bb0b10c610c7554280e823ff7989db1c