Malicious PDF — malware analysis report

Static analysis result for SHA-256 05037acf14ce43f9…

MALICIOUS

PDF

86.6 KB Created: 2021-04-18 06:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff2ec93a57968cca3c4ce0cd046b55dd SHA-1: 813a34dd434fe7acd8882f66afaed50bf36eca73 SHA-256: 05037acf14ce43f97690b2075f679d7bab1ee384de2960ef10433d8d5166405f
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 0.9998

Heuristics 7

  • 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 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://xajibur.ru/strik?utm_term=sony+acid+pro+7.0+keygen+free+download PDF link annotation
    • https://xunijududivajol.weebly.com/uploads/1/3/0/9/130969830/vajalewebi_vikegepuvu.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/carbon_footprint_article.pdfIn PDF document text
    • https://takokapaxuv.weebly.com/uploads/1/3/0/9/130968961/4646558.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/falafunu.pdfIn PDF document text
    • https://solekavugixe.weebly.com/uploads/1/3/3/9/133999951/sexemederunaponor.pdfIn PDF document text
    • https://bitoranajezope.weebly.com/uploads/1/3/1/4/131453137/1219824.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/bcBeheY/amazing_facts_revelation_now_episode_1.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/264e1f6.pdfIn PDF document text
    • https://cdn.sqhk.co/zenegiwowi/UdPgi8N/28829249448.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/fofuxozurafoja.pdfIn PDF document text
    • http://penexej.mywebcommunity.org/public_finance_and_taxation_in_kenya.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/cd5e7881-8691-4679-b665-95af381e2e15/how_to_use_keurig_k_cafe_milk_frother.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa5ad2ee-ce20-46dc-bbdb-05950f552d3a/nixubakex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6ecfe5-8944-4786-8579-c29a0f92b46f/how_to_import_file_to_garageband_mac.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/17630468224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149742f9-c20e-451a-975c-40d0b29d8259/bait_fishing_trout_rigs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b29165c1-98c6-46d9-95d9-c41491ead429/which_of_the_following_are_the_4_levels_of_measurement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f522aa91-e7da-47ff-8380-d01272545bcc/scientific_method_review_worksheet_middle_school.pdfIn PDF document text
    • http://gulagopafed.onlinewebshop.net/38_bcs_written_result_2020.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_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 5760 bytes
SHA-256: 798d1f2de6131d588aaabeebb0fc3cf7b6015d300c726f490d86f61c11b1cc46
font_01_sfnt_off00012618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12618 11740 bytes
SHA-256: 1ae5b605b361d4e926c46b36fa769610c374695b7dfce1fdf638dafc417857a7