Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c000043d110db8…

MALICIOUS

PDF

81.4 KB Created: 2021-04-07 01:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e0432cc56d814cb863a08dc54b251f28 SHA-1: a1a237bbb6416992b0acb5b0f16439fe1c59dfd4 SHA-256: 75c000043d110db800d5c6ceac98764aebf73bb61a60d6b8b319fdbf15499153
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded URLs that point to known malicious redirectors and disposable hosting sites, indicating an attempt to lure users to malicious content. Heuristics confirm the presence of malicious redirector links and a link farm structure, strongly suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=barangay+capacity+development+agenda+format In PDF document text
    • http://filemarker.store/95138938909i1kjt.pdfIn PDF document text
    • https://kexazupaxi.weebly.com/uploads/1/3/3/9/133997339/nezukopuxope.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/7394425685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_6063e9c2b103b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391314/normal_5fcc8d12b507b.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/dUggWij/custom_notification_ringtone_android.pdfIn PDF document text
    • http://avtovishki-msk.ru/elixir_of_life_little_alchemyo6680.pdfIn PDF document text
    • https://cdn.sqhk.co/simumufij/eoTqmos/overlapping_events_definition_math.pdfIn PDF document text
    • http://likelid.xyz/ejercicios_resueltos_de_programacion_lineal_metodo_graficoduiep.pdfIn PDF document text
    • http://goldstein.berlin/skyui_mod_configuration_menuudfot.pdfIn PDF document text
    • http://wisecreditscore.info/lomin5lop6.pdfIn PDF document text
    • https://devitigofe.weebly.com/uploads/1/3/1/0/131070043/3287716.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487894/normal_5ff39cfbcc33a.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/keganumerx03.pdfIn PDF document text
    • https://fowazepare.weebly.com/uploads/1/3/1/4/131406063/vesixo-budifu-zepozezuvivu-jisimunebun.pdfIn PDF document text
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/kopitolijo_waredonolinudon_lajujuwexozudif.pdfIn PDF document text
    • https://vuxamirajuka.weebly.com/uploads/1/3/6/0/136082549/7878514.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/f0HMOgg/homemade_face_mask_for_oily_skin_and_pimples.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/ijfhhhC/najonebutoji.pdfIn PDF document text
    • http://gedozudusinap.mygamesonline.org/tuvegowa.pdfIn PDF document text
    • http://extrameets.fun/zezezeritovarivrfmjs.pdfIn PDF document text
    • https://cdn.sqhk.co/keximovib/ddK6PyF/daddy_long_legs_book_common_sense_media.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lelikerakovet.atwebpages.com/sample_action_research_in_ethiopia.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 5508 bytes
SHA-256: 1094415dc16c331dfca0bbfa3390f25b3334fcb81dd64fe810a66001fd536842
font_01_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 11096 bytes
SHA-256: cb2dd8f3dec145e43af7a4c07e1fbee7fc8d2e61ac41d57e79d7f3473885fb74
font_02_sfnt_off000121e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 16220 bytes
SHA-256: 609cb8d2f9dddca023e57c5feb23bc7e590fa215bcaa224ddc81979a305fd0f4