Malicious PDF — malware analysis report

Static analysis result for SHA-256 3646f4eae738dd94…

MALICIOUS

PDF

79.7 KB Created: 2021-03-04 20:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 93a16005e74c9d43bae301c315d6916e SHA-1: 9fa970fc1bdea087db669697dab42fd7cc2e3717 SHA-256: 3646f4eae738dd94e06ac610bbbcbaa9827ffbb2bc3ce2bf28f7d6f166775394
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://baarspo.ru/award?keyword=which+college+literature+class+is+the+easiest PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413236/normal_5ff8a07b4f195.pdfIn PDF document text
    • https://sedeberelaniku.weebly.com/uploads/1/3/6/0/136030724/773197.pdfIn PDF document text
    • https://cdn.sqhk.co/misumirotoj/jeodVii/3288348442.pdfIn PDF document text
    • https://cdn.sqhk.co/rokajoten/ihefgfx/blank_map_of_uk_and_europe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451212/normal_5fddd36911e61.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/V52Khhf/10914455216.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/2631298.pdfIn PDF document text
    • https://nukarudurarera.weebly.com/uploads/1/3/1/3/131380042/6550630.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/hdM4jc2/66194224124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497697/normal_60347dbe9e3e9.pdfIn PDF document text
    • http://ketijuke.22web.org/how_to_pair_my_skullcandy_earbuds_to_each_other.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/hWjhjfL/carnivores_dinosaur_hunter_mod_apk_android_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466154/normal_60016b8985188.pdfIn PDF document text
    • https://pakoverixofe.weebly.com/uploads/1/3/4/7/134771358/804061.pdfIn PDF document text
    • https://wonelapafilujol.weebly.com/uploads/1/3/1/6/131606162/324321bb823c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450517/normal_6009f15eadce3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekikoki.rf.gd/medical_certificate_format_for_leave_of_absence.pdfIn PDF document text
    • http://katezoluvezile.epizy.com/78355832748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7baac113-c7e1-4910-8bc2-1116a0c5f90c/buenos_dias_princesa_pelicula_completa.pdfIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_776a377cdc244e5cb5a12fc542ab952d.pdf?index=trueIn PDF document text
    • http://juwelaloz.epizy.com/riduttori_epicicloidali_bonfiglioli_catalogo.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_fd51d37fdced44a8bf95c620b241c159.pdf?index=trueIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_0c66ae0c680744d58a7a63d9750ec982.pdf?index=trueIn PDF document text
    • http://sisurafuza.epizy.com/how_to_tell_if_i_have_an_allison_transmission.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_f86fcfe57bdc4f64abdbeddef86a033c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23f9015a-5c1c-4320-b923-0eb00543eeff/how_to_pass_the_minnesota_written_driving_test.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_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 5072 bytes
SHA-256: 58b37736fb48459873c567498711274f6073488225a58e4e203b01b1783a446a
font_01_sfnt_off00010d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6B 10288 bytes
SHA-256: 8c5413ea7eebb3b768820bc3dcc5007bfcd507da0cfbddea77d96717e9ca55ed