Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbde8b2de358f161…

MALICIOUS

PDF

74.6 KB Created: 2021-03-12 20:00:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0aefb633a10adff0077ebbc4270a9362 SHA-1: 5e69fbd2d176561127e559556026c4f875e6a57a SHA-256: cbde8b2de358f1612214f96b4fb1d383254556412c6d8569db49555e6f32a60f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are presented as free downloads for various documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggests malicious intent, likely phishing or malware distribution. The ML classifier also flagged it with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/award?keyword=auditing+and+assurance+services+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/jonilinenuvo/DVSgjev/63670390819.pdfIn PDF document text
    • https://cdn.sqhk.co/temegolu/ifhbH0V/24012827099.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/ylha7jj/my_talking_ginger_2_apk_download.pdfIn PDF document text
    • http://b4shop.icu/distance_christina_perri_piano_sheet_musicdht0d.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/egihbkj/funny_alexa_alarm_sounds.pdfIn PDF document text
    • http://mesretly.xyz/vejaderibofuberexorubuomkz.pdfIn PDF document text
    • https://cdn.sqhk.co/vapitinab/ijbhiic/52864545795.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/2khgicJ/sabado_gigante_el_chacal_de_la_trompeta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://damedosa.rf.gd/bhu_bsc_entrance_exam_paper_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56da1527-50f7-48e0-b776-6e575259220a/35782529877.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/66300379658.pdfIn PDF document text
    • http://luwatejanif.epizy.com/ubuntu_server_virtualbox_image.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/bhojpuri_gane_video_karne_ke_liye.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e098252-1c00-4978-83f1-a756cd7137ca/meselanovatedal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e93892-a33e-44c7-802f-9bd1baa5f086/jetblue_carry_on_luggage_size_limit.pdfIn PDF document text
    • http://vupevepodovol.rf.gd/round_baking_pan_springform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa2fe24-7683-4fa5-8a8b-c5fd41cf7cba/virtual_lab_the_cell_cycle_and_cancer_instructions_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/fireflies_nct_dream_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/global_reinsurance_market_report_2017.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000d3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EF 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 5464 bytes
SHA-256: 69ae7388233db4e91875274e86018059ae53b4baebfa4ccf4d3343cd773aacb8
font_02_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 10252 bytes
SHA-256: c4f47093c3eabebe745c05e4bd3cbc9b5b2acf171ff79f2e7ab57893c8e1662b

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