Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec813c5653a0372…

MALICIOUS

PDF

79.2 KB Created: 2021-05-30 08:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c34a9f288ab3eda465144f173e43dd66 SHA-1: d7f7f92a305df5c989d5e67709b3b596992c41c8 SHA-256: dec813c5653a0372198f37cbf76c58381ffbf83aa82b7a30097eb2be8a9515db
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://dugedepap.ru/strik?utm_term=bossier+parish+sheriff%2527s+dept+benton+la PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481520/normal_5fe4630aee487.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/4f941e.pdfIn PDF document text
    • https://toginomaba.weebly.com/uploads/1/3/4/0/134042469/8297876.pdfIn PDF document text
    • https://lusugola.weebly.com/uploads/1/3/4/5/134599647/jagagizoso_zopidepir.pdfIn PDF document text
    • https://dofenerezi.weebly.com/uploads/1/3/4/4/134446603/eff310a823.pdfIn PDF document text
    • https://xixinuwomisit.weebly.com/uploads/1/3/1/4/131437484/gisibesara-lijatorax-purovok.pdfIn PDF document text
    • https://wimukesogizat.weebly.com/uploads/1/3/4/6/134639197/79bfd3be02a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_5fe8663f4186d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_60683f973a4c0.pdfIn PDF document text
    • https://lanufirosonez.weebly.com/uploads/1/3/4/7/134704233/634d2a325063fbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473053/normal_604fa4cb15d73.pdfIn PDF document text
    • https://pizijejubuga.weebly.com/uploads/1/3/4/8/134883891/08506eb852d78.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://uploads.strikinglycdn.com/files/a3f8b67f-783d-4fad-9b45-26b042aae2bb/excelsior_springs_restaurants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f36779-ecb3-44ae-b70c-398d7a282a1e/industrial_organizational_psychology_graduate_programs_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64b3484-4eef-42e6-926e-4e60e7b6cbdf/boy_scout_traffic_safety_merit_badge_pamphlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88301a4-090d-4aee-8bbf-a4fcbf3fb884/xodolixatarupuserifapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ba66d4-4b47-4924-bb3d-8d23748a07f7/romeo_and_juliet_1968_watch_online_with_english_subtitles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/870b5ff3-e0e7-4024-841b-e388b874170c/continental_girbau_washer_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d22255f-f043-4590-bb49-acc6339314ff/does_disney_plus_cost_on_roku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1cd73ab-8853-4135-857e-ea2e386d7dfb/patriarcas_y_profetas_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc7e57e-22d9-4158-81a0-f43921bbb0df/12075770738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f839f66-03a7-498b-900d-598ddb267158/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51dbc7cd-06e0-4648-adf9-79c103380504/how_to_update_farmville_2_country_escape_on_pc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 5140 bytes
SHA-256: 88a1a79d089b8878e3d57cf05cefdec6f3c91e6e1b66d413b745011cb7fb1aca
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 12752 bytes
SHA-256: 747c3eaf098159b4657af11fe8598f1a93ac9fb871db1dfc45ee78c7dac7b115
font_02_sfnt_off000120a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176