Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ff5c8c593022c3…

MALICIOUS

PDF

103.4 KB Created: 2021-03-31 04:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 65d335ee7a84fb52f9b137566ce46232 SHA-1: 9e30569488f0815d7036ec00d69670afc97ed5c4 SHA-256: 70ff5c8c593022c300796dfb5cb3964ec09e2328c353109edb284fc48ec3a9e4
194 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 0.9986

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/wix?keyword=changing+species+worksheet+answers+icivics PDF link annotation
    • http://dezlice.ru/color_island_kitchen_cabinets_greenwunfm.pdfIn PDF document text
    • http://islemleriniz.org/67463767481k100b.pdfIn PDF document text
    • http://lumacy.site/jevalirufomob4gq3.pdfIn PDF document text
    • https://wudusalulolatus.weebly.com/uploads/1/3/1/6/131606476/mekumobomelu_pewotoxupi.pdfIn PDF document text
    • http://evromotors.net/fefovuzojolifejinunusoext9p.pdfIn PDF document text
    • http://bostpolamos.site/28685639746eyaqi.pdfIn PDF document text
    • http://weraka.online/kafebakejetofodobunewolq6qzq.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://govnosiakxws.online/gakejoxilivevepgo4ir.pdfIn PDF document text
    • http://azakalaza3.xyz/the_bell_jar_summary_videoofjv8.pdfIn PDF document text
    • http://top-odejda.com/inform_educate_entertainsne8g.pdfIn PDF document text
    • https://mavipevawifuduv.weebly.com/uploads/1/3/4/5/134598931/xiromis.pdfIn PDF document text
    • http://monstergym.ru/edit_photo_in_paint_online5q830.pdfIn PDF document text
    • http://walletelectrum.buzz/using_inequality_signs_worksheet3gi75.pdfIn PDF document text
    • http://submonster.xyz/how_to_start_an_evaluation_essay_introductionb2rx1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1b1cc5-7cf6-4131-ad37-0aec369ade9d/letter_of_resignation_board_of_directors_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/382f4ce6-a84d-46bd-b96d-4a8ad815a2a5/biological_half-life_is_the_time_required_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d80033b-ceef-4af3-a151-f0918204517b/tecumseh_hm80_service_manual.pdfIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_30bde426da61492ab69cb3bb36b90f83.pdf?index=trueIn PDF document text
    • https://df867d32-629d-4b48-af14-2fc5df20f827.filesusr.com/ugd/287761_be0502728e9848e8805bf68a64e6ef78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92754338-835c-4081-873b-32ba389b9f14/mizesuwutinim.pdfIn PDF document text
    • https://40052bae-d6b0-4be3-9c84-96956a804c69.filesusr.com/ugd/32907c_506a3fa751ed4fef81e9d2c29b12b8df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ba954b-cbda-4b69-bab6-83637963dfbf/48825214522.pdfIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_767d7d5b1111483bbd114e16527ef763.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E64 2828 bytes
SHA-256: 85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
font_01_sfnt_off0001585e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585E 5284 bytes
SHA-256: 8f6ec32e2ea5f1516fc2fa5da482126ffdcfbe72ab9c6a3cffa24a386fea09ca
font_02_sfnt_off00016a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A67 10172 bytes
SHA-256: e40469ef1b97af02a96d727ca2a5d20d24ebcc4bde0918dc9e8fedddf6c21e0d