Malicious PDF — malware analysis report

Static analysis result for SHA-256 b456427ecb62a03e…

MALICIOUS

PDF

87.0 KB Created: 2021-06-10 00:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 12b4c3e1b5afaed57c8e88da88642ac7 SHA-1: ae89f53a6034d9a26cd80c903e0135eca11ba6e6 SHA-256: b456427ecb62a03e8b875f6e06b1ce34e4fc914f3fa9dec2627213da18f69859
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://pixomot.ru/pbw?utm_term=street+fighter+alpha+3+apk+android PDF link annotation
    • https://zexivavu.weebly.com/uploads/1/3/4/8/134872555/673438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470692/normal_6003d7291a307.pdfIn PDF document text
    • https://pimabebobi.weebly.com/uploads/1/3/2/3/132303226/nimowojigerugib_jajedew_jigifuwewexa_tasezeserun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_6038420314a9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5fd1e33dbdd6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_6022f552a0702.pdfIn PDF document text
    • https://fagadixiridare.weebly.com/uploads/1/3/5/3/135304990/8528464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_601881be201d3.pdfIn PDF document text
    • https://tusukufuduma.weebly.com/uploads/1/3/4/4/134458322/16755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368240/normal_6007a2012e7f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468289/normal_60beaa387c67b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479433/normal_601603bb97895.pdfIn PDF document text
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/pawivil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gokewisu.pbworks.com/f/livre_terminal_s_physique_chimie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865a014e-dd0b-4f9a-9879-0c5e02d5a1ed/96990877207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65d0377-c79d-45cd-a902-de5650fa6584/ava_gardner_night_of_the_iguana_beauty_salon.pdfIn PDF document text
    • http://nusometa.pbworks.com/w/file/fetch/144992955/star_metal_ore_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaaffbc7-59bc-484d-8166-f0c3a26111c0/mosepumudaratovib.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144920487/ieltsfever_reading_test_40_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91bb4f5a-d8d8-4e8b-ac95-2135e47ccb23/28202196563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2f62f1-fe98-4fda-9088-9b43e2c81880/how_to_turn_on_wii_u_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b43f1e-f96d-48bc-940a-2e14eb19d88c/35368084352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaff9787-0f9e-4813-8d33-575735d454d0/73840864130.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_off000114c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 5456 bytes
SHA-256: 1602716f6799812db3ab5e66db7ccc7f3ad150b1dc492c5662b97afe7e9834d9
font_01_sfnt_off0001274d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274D 11708 bytes
SHA-256: 76e9df9104b1b014a2fa8532ed48f5bcef15784ebb3c7ab7e9863735cf57aa53