Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c6e0fe2dc78c22…

MALICIOUS

PDF

97.4 KB Created: 2021-03-25 14:51:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 393e9aa5f203a81414f7d943d30f9873 SHA-1: 25b1491e8b222f2e6ba25ab5fc028ed5f6217c55 SHA-256: b8c6e0fe2dc78c2209de3225de871bed49dd19943d913931cd01e434497a96cd
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/123?utm_term=worksheet+on+symmetry+for+class+3 PDF link annotation
    • https://cdn.sqhk.co/rowagana/VhbaFK2/excel_sheet_formatting_shortcuts.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/wGltlie/vozun.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/20333099980.pdfIn PDF document text
    • https://cdn.sqhk.co/mepofazobi/yhgrjzm/bewejibukagire.pdfIn PDF document text
    • http://badgesverified.com/kim_cang_quyn_n7wpqo.pdfIn PDF document text
    • http://lidzadva.xyz/pefuzotenudegojigezujakiphgvm1.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/8940107.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/eaPiay6/gutasomozobikese.pdfIn PDF document text
    • http://golixudib.mypressonline.com/how_to_make_animated_in_photoshop_elements.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/cover_letter_sample_download.pdfIn PDF document text
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/6606643.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/dugibawefuzeronara.pdfIn PDF document text
    • http://all-gopro.com/how_to_take_care_of_diabetes_type_2ysc8p.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/causas_sociales_del_alcoholismo.pdfIn PDF document text
    • http://srakan.space/manualidades_para_navidad_con_papel_aluminiohz110.pdfIn PDF document text
    • http://umdtheatre.ru/miss_peregrine_home_for_peculiar_movie_free_download1ghw9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/37949cab-7fb9-4814-ba6c-a201b912ca0c/14099335158.pdfIn PDF document text
    • http://vewawisu.onlinewebshop.net/58974969418.pdfIn PDF document text
    • http://muluwokixo.onlinewebshop.net/brahmacharya_vigyan_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b74e9a7-6c11-47ef-af42-b03a2cf01eb9/how_to_use_audible_on_kindle_paperwhite_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/949583bf-be52-4aad-80bc-c53cd290f362/does_netflix_have_the_secret_life_of_pets_2_on_sky.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/irrigation_engineering_lecture_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e06acd-cebf-4094-afb6-e8fa9d0435a9/soguputebomubuzowanifotul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001262b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262B 5464 bytes
SHA-256: 1bd68f95d6afabd93e61bb8ecfc629f56ae45c3959e01b8264ce422367ceecd5
font_01_sfnt_off000138ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AE 10820 bytes
SHA-256: 81e25310feecc48092be74fe9cd3ef8859ade5dabc3fc921216a7212cd5190b1
font_02_sfnt_off00015d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4A 8060 bytes
SHA-256: b6070ef3229ece93e84268147e5eb840c3355416408a0de866b2367559d1aa82