Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc6377a7cf74dbd…

MALICIOUS

PDF

77.0 KB Created: 2021-04-20 08:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 327a7fa0baf1913095f56b3b8f5238a0 SHA-1: 167ad0694afe3d6ffb756ac1378fedc69e3081ff SHA-256: ddc6377a7cf74dbd1c58c962ecac462013a7a44132f69beac1c698e1511ca72b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=diagramas+uml+casos+de+uso+ejemplos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446036/normal_606631da08b14.pdfIn PDF document text
    • http://dutusejutax.22web.org/free_breathless_by_shayne_ward.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_603f89d1adcef.pdfIn PDF document text
    • http://debopuforu.22web.org/50797791457.pdfIn PDF document text
    • http://groby-ritual.online/tipos_de_fallas_en_cimentaciones_superficiales4it04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443814/normal_5fd77c137cd68.pdfIn PDF document text
    • http://momentikshop.space/nuwamixilirosoxalokgkct0.pdfIn PDF document text
    • http://exampl1214.com/static_and_dynamic_surface_tension_measurements2flk9.pdfIn PDF document text
    • http://sale20.site/196920641619okbg.pdfIn PDF document text
    • http://gayerkan.com/77697463864vhvkk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387573/normal_6000fee79c747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_602cd7a7c0340.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_b3f9c7a44faf4506b4025b2e720f3b3b.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_a8ddd5aad9284308a94eab0a9e617820.pdf?index=trueIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_32102b46254f471e8b6cc5521e112936.pdf?index=trueIn PDF document text
    • http://poxugexi.epizy.com/used_2019_lexus_rx_350_l.pdfIn PDF document text
    • http://fajufavutipo.epizy.com/50401618891.pdfIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_a31c460b19ba4bda89e263bb32400319.pdf?index=trueIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_d7e134a4c29c46bf9925c9ad72dc4465.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/164b8323-134f-4457-9290-06055a80170c/ffxiv_level_6_aetherial_wheel_stand.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_489e23e3f30c444293b08fa2631399da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28dfb61-41ab-4d66-8dac-0c2b0d616fec/37657261651.pdfIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_dc40b0bfa2db472489970d1b5dcb663b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa72230-bb0f-4833-a820-ce3aac299eed/honda_rebel_1100_engine_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a6d6ca-7f56-4366-98e9-d42af2ff1665/hp_officejet_pro_8600_not_printing_yellow.pdfIn PDF document text
    • http://duvasupe.epizy.com/narcissistic_personality_disorder_treatment.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 5468 bytes
SHA-256: 0ca0a59b9cce7f02f36f53c9c08d5a73d03e8f58038e79d954c3591482e0f9ef
font_01_sfnt_off0000ff73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 11228 bytes
SHA-256: b5efdb3137d11f8823d4b67c186b83938c3179855a49c77624b96b8a43d8927f