Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39cfd1a9e869cbb…

MALICIOUS

PDF

75.7 KB Created: 2021-03-09 04:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a11f63746510f51a1978b3cb2a043d22 SHA-1: b1d01a3aa007decc87f75bd2769ce215f1927a0b SHA-256: b39cfd1a9e869cbb750d7ec7bafa4e105fc91f9a98d9c5c6890ca6d9021f2ba2
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary suspicious URL identified as 'https://resalured.ru/award?keyword=pdf+file+online+edit+free'. Heuristics indicate the PDF acts as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://resalured.ru/award?keyword=pdf+file+online+edit+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449603/normal_601d98f7d3a1f.pdfIn PDF document text
    • http://zdsshop.top/what_is_media_and_communication_degreetwvgz.pdfIn PDF document text
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/bejopofipovoxu-munapoboxatoti-tevonamotiz-nazudowina.pdfIn PDF document text
    • https://gibetixogi.weebly.com/uploads/1/3/1/6/131636946/6117078cd3717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_6022d79c64a6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404739/normal_5fede67f750c2.pdfIn PDF document text
    • https://sosepokapebovi.weebly.com/uploads/1/3/0/8/130814645/6832898.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/bidotaruwibimev-vutajan-kilekow-sakonim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449170/normal_5fe3b9528c724.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/asics_cricket_shoes_size_guidewqetb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_600a9aa0d3f25.pdfIn PDF document text
    • http://habercigo.com/2015_jeep_grand_cherokee_pcm_problemszzkzs.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/8841638.pdfIn PDF document text
    • https://majejuwusi.weebly.com/uploads/1/3/2/3/132303270/lajetidol_lijuxutezoxu.pdfIn PDF document text
    • http://istlan.fun/horse_games_download_free_full_version_pctohgt.pdfIn PDF document text
    • https://zejinimab.weebly.com/uploads/1/3/1/8/131856072/3940722.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pegozegi/application_of_biotechnology_in_medicine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/731749b8-b3d2-456e-b9a2-b989a0ce7ba6/jisawikoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/625497c4-648e-4477-b32f-2ba21623f0f3/wodinaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c616e08b-efc2-4ead-b1b3-64ba9cb62002/roomba_780_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/responsive_adaptive_web_design.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/jumping_the_broom_ceremony_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79926171-b79e-4a9a-92df-ea1ef1ad4ee6/make_your_home_among_strangers_chapter_2_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e1842a0-ebc3-41c5-a836-507a9b597c34/ryobi_drill_press_vise.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/lvl_guide_wow_vanilla_horde.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/11398364719.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_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 4516 bytes
SHA-256: 6a599504e67e97652243b4fc2632fa6f5093528e4c8ef7601dc24dbfa3c9436c
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10020 bytes
SHA-256: 370a1e84527c904e9428a13c9b3c7ad4ec78c86d80e0bea4c5cb966b17d88b7d