Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21d1a21424e101d…

MALICIOUS

PDF

78.1 KB Created: 2021-03-29 20:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c0348e116cbb5249201347343a039e12 SHA-1: 2249ea6fd409a1d88cc84c085f5aeffbc9e01e91 SHA-256: a21d1a21424e101d056162fdf24b2e9be8833f9a1c7da6c699742fa08562611d
126 Risk Score

Malware Insights

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

The PDF document is classified as malicious by ML and ClamAV, and exhibits characteristics of a link farm on disposable hosting. The document body, though heavily obfuscated, appears to reference a 'Schwinn 230 recumbent bike manual' to disguise its malicious intent. Numerous embedded URLs point to suspicious or disposable domains, suggesting a phishing or malware distribution attempt.

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://gimoguvi.ru/strik?utm_term=schwinn+230+recumbent+bike+manual PDF link annotation
    • http://slmit.space/vendo_vending_machine_company46pfh.pdfIn PDF document text
    • http://gufutaca1.xyz/28192274820fnjp.pdfIn PDF document text
    • http://lightly.store/26774109890twga4.pdfIn PDF document text
    • http://trelon.fun/dell_optiplex_gx280_audio_drivers_for_windows_7_32_biti7xz3.pdfIn PDF document text
    • http://setofexperience.site/lol_mmr_chart1grzv.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/77681225221wgsm4.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/ISjgxbP/vulotesuzobam.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/zjjr7jc/want_to_train_your_brain_forget_apps.pdfIn PDF document text
    • http://yesnutural.space/529830557652kc2v.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/rheKLje/70292138431.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/cheA5jG/82901283412.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_dbf802c1966645cab9e71916f86fe4df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/android_studio_calculator_app.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/10335334663.pdfIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_7bba94b3fe8f4a4d941ded915bf8c03f.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_648f9a3425714f80a73cb9b90a4a87a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/vomilonofati.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/abietic_acid_solubility_in_chloroform.pdfIn PDF document text
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_01c28b9be0f14c92893e1760dd6143c8.pdf?index=trueIn 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_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 5700 bytes
SHA-256: 2499976e77e515548277ad068e8ea82870d0d30e83dfea131e0d1a7139b03f02
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 10768 bytes
SHA-256: 2eba45dd0bea55bb7e0d6cc6fb05b6684a0e4f68a902a624d829ff3dd2c001d9

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