Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d1e39fbb472b80…

MALICIOUS

PDF

72.7 KB Created: 2021-03-22 00:27:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 596e56a6f99d5b9f35570c0d2232cc7e SHA-1: d4302110e94a894fb34b9b173b807e2dcde68e6c SHA-256: b4d1e39fbb472b80f681aba95245fc37aad3ff7f43bcbb76d87f768bcc0ad8a6
126 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous external URIs pointing to various domains, some of which are hosted on disposable infrastructure. The primary purpose appears to be directing users to potentially malicious or phishing content through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://jacksth.ru/wix?keyword=h%2526r+block+coupon+2020+in-store PDF link annotation
    • http://rugegav.mywebcommunity.org/what_are_some_curriculum_based_assessments.pdfIn PDF document text
    • http://mipefep.22web.org/gizasuroroni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407327/normal_600b4ef3c5ab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_601a8146a7f7b.pdfIn PDF document text
    • http://bogavevi.22web.org/jaipur_local_travel_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456134/normal_5fd1a8beb31c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_6042c4a096d4a.pdfIn PDF document text
    • http://luxisulejoxo.getenjoyment.net/radovuzubekotologixenuti.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/richard_williams_the_animator_s_survival_kit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://temavodagoja.rf.gd/nezemiga.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/algology_textbook.pdfIn PDF document text
    • http://vaxesopubowutuf.rf.gd/34070537992.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_b068f3e4bce744ceaedaeee35bc64fb5.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_11efb6b125c24e9aafe6bee2c43a2f33.pdf?index=trueIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_6c530d63651f4a6eaac03bb527629248.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_c22eefe0c7414a0989752c0a7653acfb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/lenovo_t510_battery_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/avid_video_engine_pro_tools_10.pdfIn PDF document text
    • http://zuvovebedevavu.rf.gd/national_antibiotic_guidelines_2020_philippines.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_932613e987b7411b9c83cb7708a570c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/can_apple_airpods_connect_to_android.pdfIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_33b3ce75c6b3440587dca95297e1c204.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/lista_de_verbos_regulares_en_ingles_en_pasado_simple.pdfIn PDF document text
    • https://f8206d31-21c4-4aef-9da9-e4259ded718a.filesusr.com/ugd/c2bdac_5cbfd2956fb14ee897bff5c0bff38b37.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_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 4116 bytes
SHA-256: 80df7defcf4ca59bf1328271a52117563e1051699b3b963ca46425f79afa100d
font_01_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 11232 bytes
SHA-256: d77c168e90353a931c38fa1cb22d7087720fa746ff48126055a8ed2ea96b29ac

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