Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f86ebef6e038e88…

MALICIOUS

PDF

90.5 KB Created: 2021-03-14 21:09:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b45c6159398a8d64d5142320759071d6 SHA-1: 538892975459ada6b31253837fe4a4c79179129e SHA-256: 8f86ebef6e038e8800f17604bc3709c74c73980e34d5e2d46100ccac358090d1
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 0.9997

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://druttle.ru/strik?utm_term=lewin%2527s+change+management+theory+pdf PDF link annotation
    • https://xuduwenonotowud.weebly.com/uploads/1/3/1/3/131379268/mezukiwujilolokirob.pdfIn PDF document text
    • https://tenewalewufubin.weebly.com/uploads/1/3/5/3/135329800/xufagosufuvemex-penenu-vuvubevefilobo.pdfIn PDF document text
    • https://lefilima.weebly.com/uploads/1/3/0/7/130775934/7184420d2dbb71a.pdfIn PDF document text
    • https://lumejukotexute.weebly.com/uploads/1/3/1/1/131163930/komiwakotuk.pdfIn PDF document text
    • https://cdn.sqhk.co/sizebadit/hfpKjdG/carnival_games_mini_golf_wii_review.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosenijosu/ogjLjcX/safe_notes_explained.pdfIn PDF document text
    • http://jimefat.22web.org/vibe_machine_aghori_video_free.pdfIn PDF document text
    • http://zuvowizetigeko.22web.org/what_is_a_direct_drive_scroll_saw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_8232f773d12944b19dd348b9cae1975e.pdf?index=trueIn PDF document text
    • http://zegemipufe.epizy.com/go-_to-_market_strategy_planning_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/newabo.pdfIn PDF document text
    • http://lulubanidoz.rf.gd/midnight_sun_full_movie_download_in_tamil.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_94a60c7487cc4f1dac6d98f429389e6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/10900857409.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/what_is_average_income_or_per_capita_income_class_10.pdfIn PDF document text
    • http://jodetiwozefiso.epizy.com/fotedawimok.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/wings_of_fire_book_1_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/zamipukujuralekolaz.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_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 5704 bytes
SHA-256: 847115ef3a7a395bc75bc387d59821684892d1fdeef12afb93c056608cbbd0eb
font_01_sfnt_off000120f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F0 10688 bytes
SHA-256: 7afa51342aad5c8711b7a696dd474ce0a4df7abe01cc2f94be63963124fdb3da
font_02_sfnt_off00014596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14596 16120 bytes
SHA-256: 2a726e4d8e078a4a4a6a0bed67b139344cab8167eb027720faf42c08020076b2