Malicious PDF — malware analysis report

Static analysis result for SHA-256 f627b425573e96e3…

MALICIOUS

PDF

75.8 KB Created: 2021-03-05 22:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1b4017984c1192f6065ecbf2bfa87191 SHA-1: a41f9694af6f5ba622c6f4899e3c5ece927ca9eb SHA-256: f627b425573e96e38268f61b22b74b7d65e9be38ec47029a6c24730c62290cb4
126 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'penny stocks', likely intended to trick users into visiting the malicious URL. No scripts were extracted, but the PDF structure and URL analysis strongly suggest a phishing or redirection attack.

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://baarspo.ru/strik?utm_term=what+are+some+promising+penny+stocks PDF link annotation
    • http://soldonlittleton.com/murizilugubub8u3wb.pdfIn PDF document text
    • http://innov-cis.net/togetuzolokawabivakbi9q3.pdfIn PDF document text
    • http://chambreop.xyz/somewhere_over_the_rainbow_sheet_music_free_piano_easye4g81.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/balzac_and_the_little_chinese_seamstress_sparknotes.pdfIn PDF document text
    • http://chambreop.xyz/firimigegak9fswg.pdfIn PDF document text
    • http://opros.xyz/ladexopaloxesopedipo3ch65.pdfIn PDF document text
    • http://jobs-ingenieur.best/70297095229muyn6.pdfIn PDF document text
    • http://airned.ru/throne_of_glass_mini_series_box_sete5vi8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijijexumejege.rf.gd/the_bfg_1989_giants_names.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/89072705721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69828590-b1b5-4e90-811e-88f6ab68b3d5/brother_xl_5130_bobbin_tension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea3d620d-d101-46c3-b239-77196eaeea8f/33472221773.pdfIn PDF document text
    • http://poxabeb.rf.gd/chuyn_file_b_kha.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd1ce82-4524-43b6-acc2-19571fe39e97/53578540463.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/fodowezidibufokowa.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/performance_appraisal_management_study_guide.pdfIn PDF document text
    • http://bibirosomuxir.epizy.com/70649969023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9045ebd-eef9-4477-b3d5-20d58572890f/85469276043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e3decc6-0d84-4447-9f92-ec3fec9407de/38736230536.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_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 5496 bytes
SHA-256: b7e37c98f6babd28467928c218361f8c7784f9030dca16f203c69bee7a905b51
font_01_sfnt_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 11276 bytes
SHA-256: 86f7c0da90c08718c1bb71324712ee09df2f47208049497344eb321178fce6b7

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