Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3def646fd58225…

MALICIOUS

PDF

78.9 KB Created: 2021-03-12 09:34:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8ea9b5d9337f8c3e787ea70a81735990 SHA-1: 23436231c1d9be3da12a3138df8195c5891ddf8e SHA-256: 1e3def646fd5822547735c44f3ed2e66ff3a4722af53eef474a9dcd67ebd20c9
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/award?keyword=ballpen+drawing+pdf PDF link annotation
    • https://cdn.sqhk.co/midijanere/ghjgeja/35500064521.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/wirola.pdfIn PDF document text
    • http://ttop-shop.com/9337270829upxjr.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/hjehdgQ/aol_10_free.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/joraxuluda_riwetulebivujip.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/numorofesodefese.pdfIn PDF document text
    • http://phtech.site/how_to_clean_my_honeywell_warm_mist_humidifier1np2j.pdfIn PDF document text
    • https://dukuvurijo.weebly.com/uploads/1/3/4/5/134522813/8f497ba2d744a81.pdfIn PDF document text
    • https://cdn.sqhk.co/zowesifona/jiU7igT/hack_de_block_strike_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/hePVQaR/lalotematovawuguwap.pdfIn PDF document text
    • https://cdn.sqhk.co/lixejudazeza/hgZidJD/lego_super_mario_app_compatibility.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/33if8hc/stockpile_stock_trading_investing_made_simple.pdfIn PDF document text
    • https://cdn.sqhk.co/fowizolomam/AbyhdqV/fofovadalego.pdfIn PDF document text
    • http://belldiscount.ru/segavupagozalipokolajilw8qhw.pdfIn PDF document text
    • http://baltika-trans.com/how_to_combine_multiple_files_into_one_macxuf7e.pdfIn PDF document text
    • https://dukopovofozevi.weebly.com/uploads/1/3/5/2/135295758/4202613.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sisufovofow.atwebpages.com/basic_english_conversation_lessons_for_beginners.pdfIn PDF document text
    • http://kerowet.epizy.com/fowanewodadijoxiraxewej.pdfIn PDF document text
    • http://vigamuwe.epizy.com/is_there_a_student_discount_for_adobe.pdfIn PDF document text
    • http://zonafikepejese.onlinewebshop.net/lipomimonizob.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 4772 bytes
SHA-256: 6a3d64ccf916c0189a13d35d507f7b8333174a8c172aca5dc7cdbae6a19fb1f2
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 9780 bytes
SHA-256: 96c6d1910e0ae1d7e87e16784ffbe73de2e4de99d8bc6d9ae111737c75081f2a
font_03_sfnt_off00011f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F97 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c